I really like Titan Quest, especially the tour through different mythologies and pantheons, but I really can't get past the fact that every map and location just drags on forever.

Is there a mod which shortens/cut down the map sizes to make the overall game more snappy?

Not that I know of. Have you tried using the speed options to see if that makes it more fun? You can set Fast or Very Fast at the character screen.

No workaround for my original question, but it's less of a drag with an exp, loot and spawn multiplier mod:
https://steamcommunity.com/sharedfiles/filedetails/?id=2027988005

The workshop mod can be downloaded using:
https://steamworkshopdownloader.io/


Edit: after having played a while the additional spawn does get tedious too.

More loot, 4x exp, but without the spawn multiplier:
https://steamcommunity.com/sharedfiles/filedetails/?id=2126910474

Yeah, my games on hold and I just got past river styx. Woo, new dlc. I am sure I will buy this even though I haven't gotten into the norselands. Just that summoner builds in diablo and path of exile are much easier. Takes effort to zap stuff and my summons are too weak in this game.