copilot/optimize-library-performance - Branch - hckhanh/fast-url

Optimize core URL building functions (20-40% performance improvement)

#81

Comparing

copilot/optimize-library-performance

(

abd77fe

) with

main

(

6a497ac

)

-57%

Improvements: 13

Regressions: 1

Untouched: 143

Skipped: 22

Benchmarks

Skipped (22)

Failed

Base URL with trailing slash + path

benchmark/urlcat.bench.ts::createUrl benchmarks::Simple cases

Regression

-57%

31 µs71.6 µs

Improved

Concatenate base URL and path only

benchmark/urlcat.bench.ts::createUrl benchmarks::Simple cases

+22%

82.5 µs67.5 µs

Path params with special characters

benchmark/urlcat.bench.ts::createUrl benchmarks::Medium complexity

+20%

112.8 µs94 µs

URL with port number

benchmark/urlcat.bench.ts::createUrl benchmarks::Real-world patterns

+15%

98.8 µs86.1 µs

Empty template

benchmark/subst.bench.ts::subst benchmarks::Parameter count scaling

+14%

67.8 µs59.3 µs

Base template only (no path)

benchmark/urlcat.bench.ts::createUrl benchmarks::Edge cases

+14%

98.2 µs86 µs

Resource with ID and nested resource

benchmark/urlcat.bench.ts::createUrl benchmarks::Real-world patterns

+14%

102 µs89.5 µs

Single path parameter

benchmark/urlcat.bench.ts::createUrl benchmarks::Simple cases

+14%

85 µs74.7 µs

Boolean and number params

benchmark/urlcat.bench.ts::createUrl benchmarks::Edge cases

+13%

113.1 µs99.7 µs

Three parameters (original)

benchmark/subst.bench.ts::subst benchmarks::Parameter count scaling

+13%

78.6 µs69.7 µs

Empty params object

benchmark/urlcat.bench.ts::createUrl benchmarks::Edge cases

+11%

26.7 µs24 µs

Join URL with trailing slash

benchmark/join.bench.ts::join benchmarks::URL path separators

+11%

16.5 µs14.9 µs

Deep path with 5 parameters

benchmark/urlcat.bench.ts::createUrl benchmarks::Complex cases

+10%

118.1 µs107 µs

REST API endpoint with pagination

benchmark/urlcat.bench.ts::createUrl benchmarks::Real-world patterns

+10%

85.7 µs77.7 µs

Passed

Complex URL with many params (original test)

benchmark/urlcat.bench.ts::createUrl benchmarks::Complex cases

+10%

182.3 µs166.2 µs

Join with separator at end of first part

benchmark/join.bench.ts::join benchmarks::Basic joins

+9%

16.9 µs15.5 µs

Array in query params

benchmark/urlcat.bench.ts::createUrl benchmarks::Edge cases

+8%

84.5 µs78.1 µs

Search endpoint with filters

benchmark/urlcat.bench.ts::createUrl benchmarks::Real-world patterns

+7%

95.7 µs89 µs

Both parts empty

benchmark/join.bench.ts::join benchmarks::Edge cases

+7%

12.9 µs12 µs

Two path params + two query params

benchmark/urlcat.bench.ts::createUrl benchmarks::Medium complexity

+7%

112.5 µs105 µs

Single query parameter

benchmark/urlcat.bench.ts::createUrl benchmarks::Simple cases

+7%

92.6 µs86.5 µs

Multiple query params (5 params)

benchmark/urlcat.bench.ts::createUrl benchmarks::Medium complexity

+7%

111.1 µs103.8 µs

Join empty first part with query

benchmark/join.bench.ts::join benchmarks::Query string separators

+7%

14.3 µs13.4 µs

Join with separator at start of second part

benchmark/join.bench.ts::join benchmarks::Basic joins

+7%

16.6 µs15.5 µs

Multiple separators in content

benchmark/join.bench.ts::join benchmarks::Edge cases

+6%

14.7 µs13.8 µs

Underscore parameter names

benchmark/subst.bench.ts::subst benchmarks::Parameter name patterns

+6%

67.6 µs63.7 µs

First part empty

benchmark/join.bench.ts::join benchmarks::Edge cases

+6%

14 µs13.2 µs

Join URL parts with slash

benchmark/join.bench.ts::join benchmarks::URL path separators

+6%

16.2 µs15.3 µs

Second part empty

benchmark/join.bench.ts::join benchmarks::Edge cases

+6%

14.2 µs13.5 µs

Large query string (15 params)

benchmark/urlcat.bench.ts::createUrl benchmarks::Complex cases

+6%

150.7 µs142.7 µs

String values

benchmark/subst.bench.ts::subst benchmarks::Different value types

+5%

69.8 µs66.3 µs

Complex multi-level template

benchmark/subst.bench.ts::subst benchmarks::Template complexity

+5%

76.7 µs73 µs

Join with leading ampersand

benchmark/join.bench.ts::join benchmarks::Query string separators

+4%

21 µs20.1 µs

Both parts have separator at boundary

benchmark/join.bench.ts::join benchmarks::Basic joins

+4%

17.2 µs16.5 µs

Parameter at end

benchmark/subst.bench.ts::subst benchmarks::Template patterns

+4%

64.6 µs62.2 µs

Unicode in values

benchmark/subst.bench.ts::subst benchmarks::Special characters

+4%

62.9 µs60.5 µs

Long strings with separator

benchmark/join.bench.ts::join benchmarks::Edge cases

+4%

14.7 µs14.2 µs

Boolean values

benchmark/subst.bench.ts::subst benchmarks::Different value types

+4%

62.8 µs60.6 µs

REST API resource path

benchmark/subst.bench.ts::subst benchmarks::Real-world patterns

+4%

62.8 µs60.6 µs

Parameter at beginning

benchmark/subst.bench.ts::subst benchmarks::Template patterns

+4%

63.3 µs61.1 µs

Medium complexity template

benchmark/subst.bench.ts::subst benchmarks::Template complexity

+4%

66.7 µs64.4 µs

Values with spaces

benchmark/subst.bench.ts::subst benchmarks::Special characters

+3%

63.1 µs61 µs

Simple single-segment template

benchmark/subst.bench.ts::subst benchmarks::Template complexity

+3%

61.2 µs59.2 µs

Long parameter values

benchmark/subst.bench.ts::subst benchmarks::Special characters

+3%

63.8 µs61.7 µs

Join URL parts both with slash

benchmark/join.bench.ts::join benchmarks::URL path separators

+3%

16.3 µs15.8 µs

Values with special chars

benchmark/subst.bench.ts::subst benchmarks::Special characters

+3%

67.1 µs64.9 µs

Parameters with static segments

benchmark/subst.bench.ts::subst benchmarks::Template patterns

+3%

67 µs64.9 µs

Nested resource path

benchmark/subst.bench.ts::subst benchmarks::Real-world patterns

+3%

66.7 µs64.6 µs

Deep nesting with IDs

benchmark/subst.bench.ts::subst benchmarks::Real-world patterns

+3%

68.3 µs66.2 µs

Join deep URL paths

benchmark/join.bench.ts::join benchmarks::URL path separators

+3%

16 µs15.6 µs

Versioned API endpoint

benchmark/subst.bench.ts::subst benchmarks::Real-world patterns

+3%

68.9 µs66.9 µs

CamelCase parameter names

benchmark/subst.bench.ts::subst benchmarks::Parameter name patterns

+3%

69.3 µs67.4 µs

Long parameter names

benchmark/subst.bench.ts::subst benchmarks::Parameter name patterns

+3%

68.5 µs66.6 µs

Two parameters

benchmark/subst.bench.ts::subst benchmarks::Parameter count scaling

+3%

70.2 µs68.3 µs

Consecutive parameters

benchmark/subst.bench.ts::subst benchmarks::Template patterns

+3%

68 µs66.2 µs

Short parameter names

benchmark/subst.bench.ts::subst benchmarks::Parameter name patterns

+3%

65.8 µs64.2 µs

Number values

benchmark/subst.bench.ts::subst benchmarks::Different value types

+3%

69.5 µs67.8 µs

Mixed value types

benchmark/subst.bench.ts::subst benchmarks::Different value types

+2%

74.5 µs72.7 µs

Date-based path

benchmark/subst.bench.ts::subst benchmarks::Real-world patterns

+2%

76.2 µs74.7 µs

Single parameter

benchmark/subst.bench.ts::subst benchmarks::Parameter count scaling

+2%

69.4 µs68.3 µs

Ampersand separator

benchmark/join.bench.ts::join benchmarks::Different separators

+1%

13.9 µs13.7 µs

Heavy encoding (many special chars)

benchmark/querystring.bench.ts::stringify benchmarks::Special characters and encoding

+1%

57.2 µs56.5 µs

Slash separator

benchmark/join.bench.ts::join benchmarks::Different separators

+1%

13.9 µs13.7 µs

Pipe separator

benchmark/join.bench.ts::join benchmarks::Different separators

+1%

13.8 µs13.7 µs

Comma separator

benchmark/join.bench.ts::join benchmarks::Different separators

+1%

13.8 µs13.7 µs

Analytics tracking params

benchmark/querystring.bench.ts::stringify benchmarks::Real-world use cases

+1%

79.4 µs78.9 µs

Join query parts with ampersand

benchmark/join.bench.ts::join benchmarks::Query string separators

+1%

15 µs14.9 µs

Empty object

benchmark/query.bench.ts::query benchmarks::Parameter count scaling

+1%

22.6 µs22.5 µs

Unicode characters

benchmark/querystring.bench.ts::stringify benchmarks::Special characters and encoding

54 µs53.7 µs

Simple join without separators at boundaries

benchmark/join.bench.ts::join benchmarks::Basic joins

25.1 µs25 µs

Join URL path with query string

benchmark/join.bench.ts::join benchmarks::Query string separators

13.6 µs13.5 µs

Question mark separator

benchmark/join.bench.ts::join benchmarks::Different separators

13.8 µs13.8 µs

Empty string values

benchmark/querystring.bench.ts::stringify benchmarks::Edge cases

52.5 µs52.3 µs

String values only

benchmark/query.bench.ts::query benchmarks::Different value types

60.7 µs60.5 µs

Single parameter

benchmark/query.bench.ts::query benchmarks::Parameter count scaling

58.8 µs58.6 µs

Number values only

benchmark/query.bench.ts::query benchmarks::Different value types

57.6 µs57.4 µs

Multi-select filter params

benchmark/querystring.bench.ts::stringify benchmarks::Real-world use cases

59.3 µs59.1 µs

Boolean values only

benchmark/query.bench.ts::query benchmarks::Different value types

61.4 µs61.2 µs

API query with includes

benchmark/querystring.bench.ts::stringify benchmarks::Real-world use cases

57 µs56.8 µs

E-commerce cart params

benchmark/querystring.bench.ts::stringify benchmarks::Real-world use cases

62.9 µs62.7 µs

Two parameters

benchmark/query.bench.ts::query benchmarks::Parameter count scaling

55.9 µs55.8 µs

Search with filters

benchmark/query.bench.ts::query benchmarks::Real-world patterns

69.4 µs69.2 µs

BigInt values

benchmark/query.bench.ts::query benchmarks::Different value types

69 µs68.8 µs

Long template with many segments

benchmark/subst.bench.ts::subst benchmarks::Template patterns

73.4 µs73.2 µs

Small object (2 params)

benchmark/querystring.bench.ts::stringify benchmarks::Comparison scenarios

24 µs23.9 µs

Keys with special characters

benchmark/query.bench.ts::query benchmarks::Special characters

51.9 µs51.8 µs

Mixed types

benchmark/query.bench.ts::query benchmarks::Different value types

71.7 µs71.6 µs

Mixed encoding complexity

benchmark/querystring.bench.ts::stringify benchmarks::Special characters and encoding

56.3 µs56.2 µs

Short values (5 chars)

benchmark/query.bench.ts::query benchmarks::Value length scaling

50 µs49.9 µs

Values with spaces

benchmark/query.bench.ts::query benchmarks::Special characters

53 µs52.9 µs

Five parameters

benchmark/query.bench.ts::query benchmarks::Parameter count scaling

68.2 µs68.1 µs

Five parameters

benchmark/subst.bench.ts::subst benchmarks::Parameter count scaling

76.2 µs76.1 µs

Long values (50 chars)

benchmark/query.bench.ts::query benchmarks::Value length scaling

58.4 µs58.3 µs

Null and undefined values

benchmark/querystring.bench.ts::stringify benchmarks::Edge cases

59.6 µs59.5 µs

Fifty parameters

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

195.5 µs195.2 µs

Array values

benchmark/query.bench.ts::query benchmarks::Different value types

66.6 µs66.5 µs

Values with special characters

benchmark/query.bench.ts::query benchmarks::Special characters

53 µs52.9 µs

Large object (16 params with arrays)

benchmark/querystring.bench.ts::stringify benchmarks::Comparison scenarios

42.1 µs42.1 µs

Form submission data

benchmark/querystring.bench.ts::stringify benchmarks::Real-world use cases

68.8 µs68.7 µs

Twenty parameters

benchmark/query.bench.ts::query benchmarks::Parameter count scaling

98.8 µs98.7 µs

Various language scripts

benchmark/querystring.bench.ts::encodeString benchmarks::Unicode and multi-byte characters

36.2 µs36.2 µs

Ten parameters

benchmark/query.bench.ts::query benchmarks::Parameter count scaling

70.8 µs70.7 µs

Array of mixed types

benchmark/querystring.bench.ts::stringify benchmarks::Array values

50.7 µs50.7 µs

Unicode characters

benchmark/query.bench.ts::query benchmarks::Special characters

62.9 µs62.9 µs

BigInt values only

benchmark/querystring.bench.ts::stringify benchmarks::Value types

71.8 µs71.7 µs

API query with includes

benchmark/query.bench.ts::query benchmarks::Real-world patterns

63.1 µs63 µs

Original complex test

benchmark/query.bench.ts::query benchmarks::Real-world patterns

85.7 µs85.7 µs

Mixed primitive types

benchmark/querystring.bench.ts::stringify benchmarks::Value types

77.3 µs77.3 µs

Heavy special characters (75% encoding)

benchmark/querystring.bench.ts::encodeString benchmarks::Character type variations

33.6 µs33.6 µs

Mixed ASCII and Unicode

benchmark/querystring.bench.ts::encodeString benchmarks::Unicode and multi-byte characters

25.8 µs25.8 µs

File path with spaces

benchmark/querystring.bench.ts::encodeString benchmarks::Real-world patterns

15.2 µs15.2 µs

Light encoding (spaces only)

benchmark/querystring.bench.ts::stringify benchmarks::Special characters and encoding

50.9 µs50.9 µs

Long values (50 chars each)

benchmark/querystring.bench.ts::stringify benchmarks::Value length scaling

56.5 µs56.5 µs

String values only

benchmark/querystring.bench.ts::stringify benchmarks::Value types

52.4 µs52.4 µs

Email address

benchmark/querystring.bench.ts::encodeString benchmarks::Real-world patterns

19.9 µs19.9 µs

Medium values (20 chars)

benchmark/query.bench.ts::query benchmarks::Value length scaling

53.1 µs53.1 µs

Twenty parameters

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

100.1 µs100.1 µs

Ten parameters

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

70.6 µs70.6 µs

Single parameter

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

55.5 µs55.5 µs

Very long values (200 chars each)

benchmark/querystring.bench.ts::stringify benchmarks::Value length scaling

80.6 µs80.6 µs

Medium array (10 items)

benchmark/querystring.bench.ts::stringify benchmarks::Array values

79.5 µs79.5 µs

Boolean values only

benchmark/querystring.bench.ts::stringify benchmarks::Value types

52.2 µs52.2 µs

2-byte UTF-8 characters

benchmark/querystring.bench.ts::encodeString benchmarks::Unicode and multi-byte characters

77.3 µs77.3 µs

Number values only

benchmark/querystring.bench.ts::stringify benchmarks::Value types

57.9 µs58 µs

Special numeric values

benchmark/querystring.bench.ts::stringify benchmarks::Edge cases

94.7 µs94.8 µs

Large array (50 items)

benchmark/querystring.bench.ts::stringify benchmarks::Array values

1.9 ms1.9 ms

Five parameters

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

55.4 µs55.4 µs

URL path

benchmark/querystring.bench.ts::encodeString benchmarks::Real-world patterns

24.8 µs24.9 µs

Small array (3 items)

benchmark/querystring.bench.ts::stringify benchmarks::Array values

46.6 µs46.7 µs

Medium ASCII string (50 chars)

benchmark/querystring.bench.ts::encodeString benchmarks::String length scaling

44.2 µs44.2 µs

Medium object (10 params)

benchmark/querystring.bench.ts::stringify benchmarks::Comparison scenarios

30.7 µs30.7 µs

Multiple arrays

benchmark/querystring.bench.ts::stringify benchmarks::Array values

54.5 µs54.6 µs

SQL-like query

benchmark/querystring.bench.ts::encodeString benchmarks::Real-world patterns

15.9 µs15.9 µs

Two parameters

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

51 µs51.1 µs

Medium values (20 chars each)

benchmark/querystring.bench.ts::stringify benchmarks::Value length scaling

59.1 µs59.2 µs

Empty object

benchmark/querystring.bench.ts::stringify benchmarks::Parameter count scaling

16.8 µs16.8 µs

Search query with special chars

benchmark/querystring.bench.ts::encodeString benchmarks::Real-world patterns

14.8 µs14.9 µs

Empty arrays

benchmark/querystring.bench.ts::stringify benchmarks::Edge cases

46.3 µs46.4 µs

Short values (5 chars each)

benchmark/querystring.bench.ts::stringify benchmarks::Value length scaling

51.9 µs52 µs

Very long ASCII string (1000 chars)

benchmark/querystring.bench.ts::encodeString benchmarks::String length scaling

49.5 µs49.6 µs

JSON-like string

benchmark/querystring.bench.ts::encodeString benchmarks::Real-world patterns

24 µs24.1 µs

Very deep template (8 levels)

benchmark/subst.bench.ts::subst benchmarks::Template complexity

83.1 µs83.3 µs

No encoding needed (pure alphanumeric)

benchmark/querystring.bench.ts::stringify benchmarks::Special characters and encoding

48.1 µs48.3 µs

Long ASCII string (200 chars)

benchmark/querystring.bench.ts::encodeString benchmarks::String length scaling

22.5 µs22.5 µs

4-byte UTF-8 characters (emojis)

benchmark/querystring.bench.ts::encodeString benchmarks::Unicode and multi-byte characters

22.1 µs22.2 µs

Mixed safe and unsafe (50% encoding)

benchmark/querystring.bench.ts::encodeString benchmarks::Character type variations

15.8 µs15.8 µs

3-byte UTF-8 characters (CJK)

benchmark/querystring.bench.ts::encodeString benchmarks::Unicode and multi-byte characters

23.6 µs23.7 µs

Empty string

benchmark/querystring.bench.ts::encodeString benchmarks::String length scaling

22.6 µs22.7 µs

Search with filters

benchmark/querystring.bench.ts::stringify benchmarks::Real-world use cases

62.9 µs63.1 µs

All spaces (maximum encoding)

benchmark/querystring.bench.ts::encodeString benchmarks::Character type variations

13.8 µs13.9 µs

Safe special characters (no encoding needed)

benchmark/querystring.bench.ts::encodeString benchmarks::Character type variations

13.6 µs13.6 µs

Short ASCII string (10 chars)

benchmark/querystring.bench.ts::encodeString benchmarks::String length scaling

18 µs18.1 µs

Pure alphanumeric (no encoding needed)

benchmark/querystring.bench.ts::encodeString benchmarks::Character type variations

-1%

13.9 µs14 µs

Ten parameters

benchmark/subst.bench.ts::subst benchmarks::Parameter count scaling

-2%

94.8 µs96.8 µs

Medium encoding (common special chars)

benchmark/querystring.bench.ts::stringify benchmarks::Special characters and encoding

-2%

51.3 µs52.4 µs

Commits

Click on a commit to change the comparison range

Base

main

6a497ac

-56.31%

Apply code formatting with biome Co-authored-by: hckhanh <6380436+hckhanh@users.noreply.github.com>

4a8a541

5 hours ago

by Copilot

-0.39%

Optimize join function for base URL with trailing slash case Reduce string operations when both parts have separator at boundary. Instead of slicing part1, removing separator, and re-adding it, simply concatenate part1 with part2 (minus separator). Performance improvement: ~19% faster for URL joining with trailing slash Co-authored-by: hckhanh <6380436+hckhanh@users.noreply.github.com>

abd77fe

3 hours ago

by Copilot

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