Build takes twice as long with >=5.92.0 compared to 5.91.0 #18694
Description
Bug report
What is the current behavior?
Our project takes around 55 sec to build with Webpack versions 5.92.0 and later (tested up to 5.93.0), compared to 24 sec on 5.91.0 and earlier with no other changes.
⬡ webpack: 673 assets
runtime modules 1.9 MiB 1835 modules
orphan modules 408 KiB [orphan] 209 modules
built modules 14.5 MiB (javascript) 5.88 MiB (asset) [built]
javascript modules 13.4 MiB
modules by path ./node_modules/ 2.76 MiB 753 modules
modules by path ./src/ 10.6 MiB 559 modules
./languages/ lazy ^\.\/.*\.json$ namespace object 160 bytes [optional] [built] [code generated]
asset modules 9.56 KiB (javascript) 5.88 MiB (asset) 233 modules
json modules 1.11 MiB
optional modules 929 KiB [optional] 7 modules
modules by path ./src/ 78.4 KiB
…
webpack 5.92.0 compiled successfully in 55360 ms
A very long time seems to be spent at this stage:
● Webpack █████████████████████████ sealing (89%)
after hashing
If the current behavior is a bug, please provide the steps to reproduce.
What is the expected behavior?
Build times similar to the previous version:
⬡ webpack: 673 assets
runtime modules 1.9 MiB 1835 modules
orphan modules 408 KiB [orphan] 209 modules
built modules 14.5 MiB (javascript) 5.88 MiB (asset) [built]
javascript modules 13.4 MiB
modules by path ./node_modules/ 2.76 MiB 753 modules
modules by path ./src/ 10.6 MiB 559 modules
./languages/ lazy ^\.\/.*\.json$ namespace object 160 bytes [optional] [built] [code generated]
asset modules 9.56 KiB (javascript) 5.88 MiB (asset) 233 modules
json modules 1.11 MiB
optional modules 929 KiB [optional] 7 modules
modules by path ./src/ 78.4 KiB
…
webpack 5.91.0 compiled successfully in 24074 ms
Other relevant information:
webpack version: See above
Node.js version: 20.16.0
Operating System: macOS 14.6.1
Additional tools: Svelte project (predominantly compiled static HTML/JS)
Let me know how I can help diagnose.
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