Close #857, typing is too fast for some fields

[plocket]

In this PR, I have:

• Can't add tests without an ajax combobox field ~Added tests for any new features or bug fixes (if relevant)~
• [x] Added my changes to the CHANGELOG.md at the top, under the "Unreleased" section
• [x] Ensured issues that this PR closes will be automatically closed

Reason for this PR

See #857. It slows down typing for cases under about 30 - 150 characters depending on the speed of the server connection. The first part of a string is "pasted" in instantaneously, but it takes 300 ms to type the last three characters of the string (100ms per character).

Links to any solved or related issues

Closes #857

Any manual testing I have done to ensure my PR is working

Ran this locally with the PleadingPower interview