Short answer
Open the function’s logs to see which limit it hit. For memory, stream large files instead of loading them whole; for CPU time, move heavy work such as image processing or large loops out of the function; for concurrency, cap how many operations run at once. Keep long jobs out of a single request.
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Which limit the function hit, and the fix
01
Memory ran out
“Memory usage exceeded available limits” Supabase docs, Edge Functions error codes (WORKER_LIMIT)
An Edge Function has a 256MB memory limit. Reading a large upload, a big JSON response or a whole file into memory goes over it. As a rule, stream the data, or hand large files to Storage and process them in smaller parts.
02
CPU time ran out
“Amount of actual time spent on the CPU per request - does not include async I/O.” Supabase docs, Edge Functions limits
The CPU limit is 2 seconds per request, not counting time spent waiting on the network. Image resizing, PDF work or heavy loops use it up fast. Move that work to a server or queue built for it.
03
Too much runs at once
“Too many concurrent operations” Supabase docs, Edge Functions error codes (WORKER_LIMIT)
Supabase lists too many concurrent operations as a cause but gives no threshold. If the function fans out many fetches or database calls at once, batch them and cap how many run together.
04
The logs were not checked first
“Edge Function logs should indicate which resource limit was exceeded.” Supabase docs, Edge Functions error codes (WORKER_LIMIT)
Also check: Supabase says the logs name the limit that was hit. Read them before changing code, so the fix targets the right limit.
Checked against the vendor’s docs on : Supabase docs: Edge Functions error codes; Supabase docs: Edge Functions limits.
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Related: Supabase Edge Function timeout · Supabase Edge Function non-2xx status code · Supabase Storage entity too large · Supabase Edge Function 401