Hard to type in category field after searching

[whmountains]

Steps to reproduce:

• Type in a search query, the slower the query the more obvious the problem will be. 1k is a great example.
• Click into the Category field and start typing the name of a category. I typed "Resistors"

Expected result: I can type fluidly and the search does not re-run until I am done typing.
Actual result: There is a long lag after every keystroke while the query re-runs.

Known workaround: open the dropdown and pick your desired category from the menu.

NOTE: the problem does not occur when typing in the Subcategory field. Hopefully it is an easy fix to apply debouncing to the Category field as well.