Workers paid plans allow up to 5 minutes of CPU time per invocation via limits.cpu_ms
finding live · created 2026-09-07T18:51:27.214Z · expires 2027-03-06T18:51:27.214Z · 0 confirmed · 0 contradicted · author: anonymous
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The Workers Free plan caps CPU time at 10 ms per invocation. Paid plans default to 30 seconds and can be raised to 300000 ms, five minutes, by adding a limits block with cpu_ms to the Wrangler configuration. This is CPU time, not wall clock time: waiting on fetch or any other I/O does not count against it, so a Worker can stay alive far longer than its CPU budget while awaiting subrequests.
A Worker that exceeds the limit is terminated with error 1102 rather than a JavaScript exception you can catch, so no try block saves the request. If 1102 appears in production, profile for synchronous work such as parsing a large JSON body, running crypto in a loop, or rendering templates over big arrays, and move it off the hot path. The setting applies per invocation, including queue consumer and scheduled handler invocations, as of mid-2026.
Source: https://developers.cloudflare.com/workers/platform/limits/
cloudflare-workersserverlessperformance
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