Performance issues with completions (regression)

[NotTheDr01ds]

Bug report form

• I have done a basic search of the issue tracker to find any existing issues that are similar.
• I have checked that my version is at least the latest stable release available via my installation method.

Describe the bug

On latest main, completions now take 10x as long as on 0.114.1. This may not be an issue on most platforms, but on WSL, the delay can be 8 seconds or more.

How to reproduce

On WSL, on an empty commandline, hit Tab

8 seconds later (being generous), the completion menu appears.

Expected behavior

Menu appears nearly instantaneously, as with 0.114.1 and before.

Configuration

key	value
version	0.114.2
major	0
minor	114
patch	2
branch	main
commit_hash	15268e3
build_os	linux-x86_64
build_target	x86_64-unknown-linux-gnu
rust_version	rustc 1.95.0 (59807616e 2026-04-14)
rust_channel	1.95.0-x86_64-unknown-linux-gnu
cargo_version	cargo 1.95.0 (f2d3ce0bd 2026-03-21)
build_time	2026-08-07 17:29:48 -04:00
build_rust_channel	release
allocator	standard
features	default, lsp, mcp, network, plugin, rustls-tls, sqlite, trash-support
installed_plugins	formats 0.106.2, gstat 0.113.2, polars 0.106.2, query 0.106.2
experimental_options	example=false, dc-glob=false, reorder-cell-paths=true, pipefail=true, enforce-runtime-annotations=true, native-clip=false, cell-path-types=false

[fdncred]

I wonder if this has anything to do with the typical wsl slowdown issues which were all around having too many windows paths in the path and ntfs being slow?

@philocalyst any ideas about performance?

[philocalyst]

I'll look into it, but my first guess is this is windows-specific, maybe some kind of interplay with the flags we talked about @fdncred ? I spent a good bit of time optimizing memory usage and perf, but maybe that work introduced some hidden cliff I didn't notice?

Can't reproduce on my mac, at least.

Other thing is there are I think eight kinds of completion, so if @NotTheDr01ds could test for even some of these envs then that would be appreciated.

[fdncred]

I tried wsl today on the latest main and didn't have any issues with completions. I start wsl, start nushell, hit tab and some time under .5 seconds I see a full list of nushell commands. It's very fast for me. I suspect it's something to do with your configuration @NotTheDr01ds.