+ 1.5 has support for Vulkan, the new faster way to draw graphics. Supported on many modern Android devices, and if enabled (change Backend in Graphics settings) you will see a massive speed boost. PPSSPP 1.5 also has the usual assortment of fixes:
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+ - Full Vulkan support, also for Android now. Very fast on supported devices. (#10033, #10049)
+ - Smarter graphics state management, reduced CPU consumption on all backends (#9899)
+ - Android: Support for Arabic and other scripts we couldn't support before
+ - Fixes to video dumping
+ - Fix Android widgets, screen scaling (#10145)
+ - Geometry problems fixed in Medal of Honor
+ - Implement immediate draws, fixing Thrillville (#7459)
+ - Software rendering improvements, speed and accuracy
+ - Partial sceUsbGps and sceUsbCam support (Android)
+ - Hardware tesselation of PSP Beziers and Splines (used by a few games)
+ - Android "Sustained performance mode" to avoid thermal throttling (#9901)
+ - Linux controller mapping fixes (#9997)
+ - Assorted bugfixes and compatibility improvements
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