[Performance] improve atom.tooltips.add

You would be surprised if you know that most of the time spent for creating the buttons, is spent in adding the tooltips to them! We might want to write a faster version of the original
https://github.com/suda/tool-bar/blob/937f75719a1002af5b207c073b6e45dd82617f44/lib/items/tool-bar-button-view.js#L121

https://github.com/atom/atom/blob/e4b9c1e0815c5c07514a0649e7ebb9b5226a2931/src/tooltip-manager.js#L113-L181

For 30 buttons, this becomes ~6ms.

Details


Which is almost the same as the whole time spent on the buttons:

Details


I am going to port the function to our package and see if I can write a faster version.

Compare lib/items/tool-bar-button-view.js at the referenced line with Atom's src/tooltip-manager.js implementation around lines 113-181. Benchmark toolbar creation with 30 buttons, then verify the faster tooltip path preserves the existing behavior and improves on the reported ~6ms cost.

Written by the indexing model from the issue text.