Slowness when typing in commit message editor due to frequent `loadUsersFromLocalRepo` calls

[maxbrunsfeld]

Prerequisites

• Have you tried to reproduce the problem in Safe Mode?
• Have you followed all applicable steps in the debugging guide?
• Have you checked the FAQs on the message board for common solutions?
• Have you checked that your issue isn't already filed?

Description

When typing a commit message, Atom starts to feel sluggish. I recorded a profile and it looks like loadUsersFromLocalRepo is getting called each time I type a key.

Steps to Reproduce

1. Open the commit message editor
2. Start recording a profile
3. Start typing

Expected behavior:

Low CPU usage.

Actual behavior:

High CPU usage.

Reproduces how often:

100% for me.

Versions

Atom    : 1.29.0-dev-c950a3e89
Electron: 2.0.0
Chrome  : 61.0.3163.100
Node    : 8.9.3

Additional Information

Zoomed-out profile (showing multiple keystrokes):

Zoomed-in profile (showing details):

[annthurium]

should be fixed by #1464 but please let me know if any additional issues come up.

[maxbrunsfeld]

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