
What specific things you have tried are a hit? What specific things you have tried are a miss?
In the meanwhile, I will assume the following default answers:
* you're using the GUI
* you're using TheTVDB
* you're processing files on a local hard drive
* the log doesn't show any network errors

Based on the assumptions above, I have run a few tests, and couldn't reproduce any abnormal behaviour at this point in time for this specific use case.
(NOTE: I use the CLI for testing because it makes running tests easy and reproducible)
e.g. 1st attempt
(i.e. clear cache, lots of network requests) is about 8 seconds:
Code: Select all
$ time filebot -rename Alias.1x01.mp4 --db TheTVDB -non-strict --log INFO
[MOVE] from [Alias.1x01.mp4] to [Alias - 1x01 - Truth Be Told.mp4]
7.877 total
e.g. 2nd attempt
(i.e. everything already cached, no network requests) is about 1.5 seconds:
Code: Select all
$ time filebot -rename Alias.1x01.mp4 --db TheTVDB -non-strict --log INFO
[MOVE] from [Alias.1x01.mp4] to [Alias - 1x01 - Truth Be Told.mp4]
1.624 total

You might get a slowdown due to a large number of possible reasons, e.g. input files located on a slow remote network share, network errors followed by multi-second wait and retry attempts, etc. I'd start by testing if it's slow for everyone
(i.e. reproducible by both you and me) or if the issue seems to be limited to you specifically. If the latter is the case, I would then do lots of trial and error testing
(e.g. if it's slow with remote files, try local files instead, etc) to see if that can give us any clues.