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    [ Fixing Pest Sharding for Modular Laravel Applications 
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 ](https://mozex.dev/blog/2-fixing-pest-sharding-for-modular-laravel-applications)

 When Pest v4 dropped, one feature got my attention right away: test sharding. My CI pipelines were painfully slow, and splitting tests across parallel GitHub Actions runners seemed like the obvious fix. I upgraded, configured the shards, pushed to CI, and waited. Every shard ran every test. Shard 1 of 4? Full suite. Shard 3 of 4? Full suite. My "optimization" made things four times worse.

   Mar 24, 2026   ·  13 min read   ·  [ Laravel ](https://mozex.dev/blog/tags/laravel) [ PHP ](https://mozex.dev/blog/tags/php) [ Testing ](https://mozex.dev/blog/tags/testing) [ Pest ](https://mozex.dev/blog/tags/pest) [ GitHub Actions ](https://mozex.dev/blog/tags/github-actions)  

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