Hi everyone,
I’m self-hosting n8n on Render using the Docker setup. Everything has been running fine for months, but recently I’ve run into a CPU issue I can’t figure out.
The problem:
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My Render service is limited to 1 CPU.
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I have a workflow that loops through items (previously processed ~300+ at once without problems).
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Now, even with the Limit node reduced to 100 (sometimes even fewer), the second I execute the workflow the CPU hits 100% and the whole instance becomes unresponsive.
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I have to restart the service just to get access to n8n again.
What I’ve tried:
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Reduced the input from ~20k items down to ~500.
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Lowered the Limit node from 240 → 100 → even fewer.
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Archived and even deleted old workflows.
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Restarted the service multiple times.
Please do let me know how I can solve this – Thanks in advance, I’d really appreciate insight from anyone who has run into CPU bottlenecks with n8n on Render or similar hosting setups.