The latest T-Rex Nvidia GPU miner version 0.12.1 brings some performance improvement for the MTP algorithm used by ZCoin (XZC), the performance should be up by 1%-3% on some video cards according to the developer. The new version also adds the ability to view the T-Rex log file directly in the web browser and fixes the issues with the Benchmark mode not working properly in the miner.
Do note that the T-Rex is a closed source miner with 1% development fee built-in. Also make sure you have a recent video driver installed (the latest for CUDA 10 support) as the binaries for both Linux and Windows are compiled for CUDA 9.1/9.2/10.0.
Source: cryptomining-blog.com