Which version, pro or tube? My 2015 pro is a champ, including in Kodi. Adding the Samsung SSD a few years back was a game changer though. Boot time dropped to 7 seconds, and no trouble with h.265 and even 1080 AV1.
Edit: To OP, I currently host my files on the shield local drive and watch with Kodi. I used to have a NAS, but am living leaner lately, and local works fine. Can easily move files to it over the network