Backstory:

I'm using the free version of MT on Windows for self-tracking for over 3 years.

Recently I wanted to see total time working on particular drawing, and I was able to do it like this:

Statistics - Custom - Add - Timeline: Documents (at top) - Files (at left).

Now at right there is a huge list of filenames gathered in these years, some with paths, some not, even some with quirky path formats like "(D:) drivename / path / deeperpath / file_name.ext" (with parentheses, slashes and spaces exactly like that).

The filelist takes around 10 seconds each time to generate or sort.

At first, every file was checked. I selected all with Ctrl+A (works instantly), clicked one of the checkboxes (MT client UI went unresponsive for several minutes, maybe over 10 min), then everything became unchecked.

I found some files I wanted to sum and checked them back (one by one it works instantly too).

Finally, refreshing all statistics takes around 5 seconds, less than generating the list of files in UI.

Suggestion:

It would be a lot easier to enter some pre-known filename wildcards, than digging in the filelist. Simplest I can think of - one pattern per line in a text area, that could be shown instead of checklist by an option. For example, using radio-buttons at bottom of "Edit Statistics" dialog:

Match:
- checklist any
- checklist all (only show/enable for the Tags timeline?)
- wildcard any
- wildcard all.