http://lainyubrp2aabmxhepbttfdbl53dct2inqifs42buvpf6w44uiitbeqd.onion/blog/matrix.html
You may need third-party software to compress rows in it, and at some point you will need to dive into it manually to remove unused strings! If your users join huge rooms with 10k+ members, the i/o value will be bound to skyrocket. One day, I had 80 LA on VPS with 2 GB ram and 1 core! After that, I moved to a better VPS for the sake of stability.