A Performance Checkup for Dora Web IDEAugust 16, 2026 · 7 min readLi JinDora SSR developerIn July 2026, we performed a systematic performance pass on Dora Web IDE. The trigger was not one dramatic freeze. The workbench had gradually accumulated an editor, resource tools, Git, logs, visual editors, and a Coding Agent. Each feature worked in isolation, while hidden costs began to overlap. This article is a technical record rather than a dramatic story. A hidden panel might still listen for data. Every few Agent characters might rerender the entire history. Search might display a few dozen matches only after scanning forty thousand files, while a Git title list might calculate every changed file in advance.