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Title: Improve SSL performance by avoiding SSLWantReadError exception and using much faster checks whenever possible by tarasko · Pull Request #629 · MagicStack/uvloop · GitHub

Open Graph Title: Improve SSL performance by avoiding SSLWantReadError exception and using much faster checks whenever possible by tarasko · Pull Request #629 · MagicStack/uvloop

X Title: Improve SSL performance by avoiding SSLWantReadError exception and using much faster checks whenever possible by tarasko · Pull Request #629 · MagicStack/uvloop

Description: SSLWantReadError is expensive. python/cpython#123954 This PR tries to predict that there will be SSLWantReadError by checking incoming.pending and SSLObject.pending() first. This check works in 99%...

Open Graph Description: SSLWantReadError is expensive. python/cpython#123954 This PR tries to predict that there will be SSLWantReadError by checking incoming.pending and SSLObject.pending() first. This check works in 99%...

X Description: SSLWantReadError is expensive. python/cpython#123954 This PR tries to predict that there will be SSLWantReadError by checking incoming.pending and SSLObject.pending() first. This check works in 99%...

Opengraph URL: https://github.com/MagicStack/uvloop/pull/629

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Inefficient ssl.SSLWantReadError exception slows down very common use-case python/cpython#123954 https://patch-diff.githubusercontent.com/python/cpython/issues/123954
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Jan 14, 2026 https://patch-diff.githubusercontent.com/MagicStack/uvloop/pull/629#ref-pullrequest-2471196619
Improve performance and reduce latency of Transport.write by attempting to send data immediately if all write buffers are empty #619 https://patch-diff.githubusercontent.com/MagicStack/uvloop/pull/619
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