That's a problem I seem to have, small maps on my games. Also think you could possibly fo voxel weapons and enemy's? I noticed my computer started to slow down and lag when playing it so that could help when someone with a lower end computer plays it.
Thanks for the report! Going to do some work on the game today, fix some bugs and hopefully release the update with the new models. We also have a trello page, in where you can post suggestions and bugs there as well! https://trello.com/b/KVxTiACn/voxelstein-ue