Lagging interface with company-mode about lsp-sourcekit

[danielmartin]

Thanks for the report. Do you have a sample project where this behavior is reproducible? Can you post the output of running M-x company-diag?

[jandamm]

For me it happens in Login/Login.swift in https://github.com/jandamm/gitlab-ci-viewer/tree/test.

I'll run company-diag later 👍

[jandamm]

Emacs 26.3 (x86_64-apple-darwin18.7.0) of 2019-09-05 on Mac
Company 0.9.10

company-backends: (company-lsp company-yasnippet)

Used backend: company-lsp
Major mode: swift-mode
Prefix: stop
Completions: none

[danielmartin]

@jandamm, SourceKit-LSP has just implemented server-side filtering of completion results (see apple/sourcekit-lsp#298). This should improve performance, specially on Emacs <27, where JSON serialisation is done in Emacs Lisp code.

Could you compile a SourceKit-LSP toolchain from top of tree and see if completion performance is better? Thanks.

[jandamm]

Hey @danielmartin, thanks for the follow up.
I've switched back to Neovim in the meantime. Having some performance issues with sourcekit-lsp there as well.
But they improved over the last months, so I'd guess company mode has gotten better as well :)

[blandinw]

For posterity, building sourcekit-lsp removed the lag for me.

git clone https://github.com/apple/sourcekit-lsp.git
cd sourcekit-lsp
export TOOLCHAINS=swift
swift package update
swift build -c release
ls -l .build/release/sourcekit-lsp