According to the Read Me (that I'm sure almost no one read) TenebraeQuake requires VIS-patched mission PAKs. NO amount of CFG editing gets this game running much faster than ≈10fps so I'm assuming this is the problem. Following the instructions (downloading the id1.vis file, backing up the "id1" folder, running the CLI app seemed to run fine, running TenebraeQuake again after the fact produced errors that I think starting with a fresh Tenebrae CFG file MIGHT be able to resolve... but I screwed around with this a wee bit too much for me to attempt to start from scratch so I'm not bothering right now and I'm not going to score this port yet. Looked great, though... too bad quake 1 CFGs aren't as tweakable as a quake3.cfg type file...