When I first got Tablo (pre-2.2.10), I had an old model Roku 2. It was somewhat slow to start playback and glacial when restarting after jumping past a commercial. I think 2.2.10 made a claim to speed up older Roku performance (somebody confirm or correct me?) Edit: My memory must be faulty. There’s no mention of older Roku performance enhancements in NEW Firmware Release - 2.2.10 end-edit.
Anyway, I got a new model Roku 2 (4210R) which is nice and speedy with Tablo. Both my older model and new model Roku 3s work fine with Tablo.