CI for Ruby 3.2 and 3.3 on Windows are sometimes abnormally slow

[daipom]

Describe the bug

Tests for Ruby 3.2 and 3.3 on Windows should finish in about 30 mins, but they can take 1h ~ 5h.

Here is what we know so far.

• This issue has been occurring since 2025-06-17.
  • https://github.com/fluent/fluentd/actions/runs/15682996309/job/44178924088
• RecordTransformerFilterTest::test error record::test: invalid record for placeholders can be very slow.
  • It appears that enable_ruby is the trigger. This test is the first test that uses enable_ruby.

It is unclear whether the impact of this issue is limited to CI.

To Reproduce

Run CI Ruby 3.2 and 3.3 on Windows.

Expected behavior

The job should finish in about 30 min.

Your Environment

Not related.

Your Configuration

Not related.

Your Error Log

Not related.

Additional context

No response

[daipom]

RecordTransformerFilterTest::test error record::test: invalid record for placeholders can be very slow.

* It appears that `enable_ruby` is the trigger. This test is the first test that uses `enable_ruby`.

The speed becomes extremely slow after (and during) these requires.

https://github.com/fluent/fluentd/blob/v1.18.0/lib/fluent/plugin/filter_record_transformer.rb#L72-L74

          require 'pathname'
          require 'uri'
          require 'cgi'

(This issue cannot be reproduced by running this test alone...)