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Lower ASGI gzip compresslevel from 9 to 4 #3735

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Lower ASGI gzip compresslevel from 9 to 4 #3735

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1 change: 1 addition & 0 deletions changelog.d/metadata-gzip-compresslevel.fixed.md
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Lower the ASGI gzip compression level from 9 to 4 so large responses like /us/metadata spend seconds less CPU compressing on Cloud Run, restoring warm-latency parity with App Engine.
7 changes: 6 additions & 1 deletion policyengine_api/asgi_factory.py
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Expand Up @@ -53,7 +53,12 @@ def create_asgi_app(wsgi_app) -> FastAPI:
redoc_url=None,
openapi_url=None,
)
app.add_middleware(GZipMiddleware, minimum_size=1000)
# compresslevel 4 instead of starlette's default 9: /us/metadata is ~70MB
# raw, and level-9 compression inside the request costs seconds of CPU on
# Cloud Run (where no nginx sidecar handles gzip, unlike App Engine flex).
# Measured on the real payload: level 9 = 5.5s -> 9.0MB, level 4 = 0.7s ->
# 9.9MB — 7.5x faster for ~10% larger output.
app.add_middleware(GZipMiddleware, minimum_size=1000, compresslevel=4)

@app.middleware("http")
async def add_cors_for_native_routes(request, call_next):
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