Performance issue on Chromium-based browsers

[noel-sebbey]

We're facing performance issues on dual listbox with large number of records when opened in Chrome (v87.0.4280.88 64-bit) or Edge (v87.0.664.57 64-bit)

The listbox initially appears as a single, unfilterable box for a while, and then loads the two listboxes with their records after some time

On page load:

After some time:

This has been tested on our local and production environments and the output times are identical. Here are some test results:
~12000 records: ~29sec
~7000 records: ~6sec
~2000 records: ~1sec

Just to note on Firefox (v83.0 64-bit), the dual listbox opens quickly (~1sec) regardless of the number of records (2k, 12k, etc)