Tested with a 18500+ library (all platforms view). Feels responsive enough even when scrolling with a keyboard. Small delay with loading when a video is attached to an entry, same as with image view. Sorting works well with little delay.
LaunchBox: First launch and shutdown kinda slow, but after that both opening and closing LB is about the same as the previous stable version. Status messages seem to be the same as before(?). When I ran the program for 5th time while testing the metadata search, I closed LB but when checking Task Manager, it was still running on background using 1GB of memory, no CPU usage.
Felt responsive and found the correct settings and pages when searching.
So far so good, best match(es) seem to appear first.