Slow vite:load of Vike files

[chrisvander]

After upgrading to Vite 6, I'm noticing slow loading of Vike-related files.

One example:

vite:load 12753.00ms [fs] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/getPageContextUrlComputed.js?v=d588ed81 +0ms
  vite:cache [memory] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/utils.js?v=d588ed81 +1ms
  vite:import-analysis 0.27ms [2 imports rewritten] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/getPageContextUrlComputed.js?v=d588ed81 +1ms
  vite:transform 0.34ms ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/getPageContextUrlComputed.js?v=d588ed81 +1ms
  vite:load 12749.86ms [fs] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/route/resolvePrecedence.js?v=d588ed81 +1ms
  vite:cache [memory] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/route/resolveRouteString.js?v=d588ed81 +1ms
  vite:import-analysis 0.52ms [2 imports rewritten] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/route/resolvePrecedence.js?v=d588ed81 +1ms
  vite:transform 0.63ms ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/route/resolvePrecedence.js?v=d588ed81 +1ms
  vite:load 12754.24ms [fs] ../../node_modules/.pnpm/[email protected][email protected][email protected][email protected][email protected]__vite@6_880a09cf6634ed8d61d828544e49fbea/node_modules/vike/dist/esm/shared/route/loadPageRoutes.js?v=d588ed81 +1ms

Any reason why these Vike files are slowing things down tremendously? Or other Vike 6 changes I should be looking at?

[chrisvander]

Additionally, noting a very slow transform of virtual Vike user server code, like in the below log:

vite:import-analysis 8.39ms [27 imports rewritten] virtual:vike:importUserCode:server +0ms
vite:transform 50288.59ms virtual:vike:importUserCode:server +0ms

[brillout]

What change exactly introduces these performance degradation? Updating from Vite 5 to Vite 6?

[chrisvander]

Exactly. With no other changes, but upgrade from Vite 5 to 6, many files are suddenly taking much much longer to transform and load the first time they're called. After they're in memory though, requests are much faster. But this takes 60sec after every server restart and is not reasonable for a development workflow.

[brillout]

I guess it's a Vite 6 regression then. Have you tried to reach out at Vite? The best would be to provide a minimal reproduction; they're usually quick at resolving critical regressions.

[chrisvander]

I'll try to figure out a reproduction. I'm not able to reproduce any difference with the boilerplates, so I'm concerned it's due to something different scaling poorly.

[chrisvander]

vitejs/vite#19171

[brillout]

👍 Keep me updated.