Optimize startup performance by deferring non-critical imports - #15353

Draft

Carreau wants to merge 9 commits into

mainfrom

claude/ipython-startup-perf-25ge56

Commits on Aug 3, 2026

Keep the pygments plugin machinery off the startup path
claude
committed
021287d
Build the prompt style on first use
claude
committed
d695716
Move the AST operator tables out of `guarded_eval`
claude
committed
ae5c6c4
Defer `platform`, `pprint`, `textwrap` and `html` to their use sites
claude
committed
8458415
Detect the kitty graphics protocol without importing psutil
claude
committed
fb110a8
Defer `mimetypes`, `locale`, `glob` and `runpy` to their use sites
claude
committed
4cb7ca1
Add a whatsnew entry for the second startup pass
claude
committed
70866c7
Annotate `_find_dunder` and put measured numbers in the whatsnew
claude
committed
2c181ae

Commits on Aug 4, 2026

Only run the psutil-free kitty detection test where /proc exists
claude
committed
8c8c732