100%+ CPU spikes when typing colon commands

[AriTheElk]

Oni Version: 0.3.9
Operating System: macOS 10.14.6

Issue: As soon as I initiate the colon-command GUI, the oni process spikes over 100% and stays there no matter how long I have the menu open (even without typing). For context, this CPU spike doesn't happen when I open up similar GUIs like the fuzzy finder or command palette.

I've also confirmed that it isn't due to a leaky vim config, as nvim inside terminal doesn't spike the CPU at all. It severely impacts the UX for me, since typing colon commands becomes incredibly laggy. Especially when trying to tab out a file path. It's so delayed that I have to anticipate the lag a few seconds ahead of typing.

Expected behavior: There should be zero reason for the CPU to spike when issuing colon-commands. Especially when I'm not actively trying to get autocomplete suggestions. I'm simply typing letters into a text box.

Actual behavior: CPU spikes to over 100% usage as soon as I hit the colon key.

Steps to reproduce: Open oni normal mode, press the : key.

[oni-bot]

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