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**Summary**
Currently in the optimistic/pessimistic lantern estimates for EIL and TBT we use the timing data computed by the FCP/FMP/TTI metric simulations as cutoffs but this leads to internally inc…
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The current streaming response API requires returning an async generator. This is really awkward to use given that so many async classes are not RAII - initialised with `__init__` and finalised with `…
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Last year we made several big improvements in the performance testing area. To name a few:
* Migrate core performance tests to Playwright
* Added support for taking measurements using web-vitals.j…
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## 什么是RAIL
- Response 相应
- Animation 动画
- Idle 空闲
- Load 加载
## RAIL评估标准
- 相应：处理事件应在50ms内完成
- 动画：每10ms产生一帧
- 空闲：尽可能增加空闲时间
- 加载：在5s内完成内容加载并可以交互
## 性能测量工具
- Chrome Devtools 开发调试、性能评测…
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#### Perceived Problem
- Cold start time is over half a second
- Combined with serverless platform, TTFB latency will easily exceed 1s in many cases
- And this is before any real app lo…
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Since ab is a bit dated I tried to use h2load. It's executes like in my example
```
h2load \
-H 'a bunch of headers'
-d 'payload.json' \
-n10 'my url'
```
and the requests are fine but the res…
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Getting multiple service alerts for BE and posthog. Need to debug the issues.
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Hello,
I would like some callbacks in the swoole_http_client
1. onHeadersReceived (With the headers array)
2. onHTTPCodeReceived (With the code)
With this callbacks, TTFB can be reduced in a …