Android boxes have poor passive cooling. If your games start lagging after an hour, your box is likely thermal throttling. Consider adding a small USB fan.
To save massive amounts of SD card space, compress your PS1 games into .chd files instead of bulky .bin and .cue files. emuelec 38 top
: The firmware is the "top" stable pick for older S905-based TV boxes (S905W, S905X) wx and above might cause lag or crashes. Common Limitations Android boxes have poor passive cooling
They flashed the new image to a high-quality SanDisk SD card. (Cheap included SD cards are notorious for failing). DTB Magic: emuelec 38 top
Turn on "Threaded Video" in the video settings. It trades a tiny amount of input lag for a massive boost in frame rate stability.