The arrival of PS1’s Syphon Filter 2 on PS Plus brings with it the ability to switch the game’s regions between 50hz/60hz.
This mechanic, spotted by VGC, now offers players the opportunity to switch game regions from 50Hz PAL (a notably slower standard) to NTSC 60Hz through Syphon Filter 2’s settings menu.
You can see how this process looks in the image below.