Changelog of Zx-81′s PSPSIM version 1.2.1:

Many optimizations to speed up the emulation in z80, video and sound emulation part.
Many games are now fullspeed (50 fps) even at 222Mhz !!
Many new render modes and screen size options (normal, fit, max etc …)
The emulator window can now be moved to fit the screen properly
Add new hotkeys to setup render mode etc …
Bug fix in the low battery watchdog
RTrigger/LTrigger keys can be used in the keyboard settings menu to navigate between Normal, LTrigger and RTrigger compose mapping.
Default Hotkeys can now be set in the keyboard mapping menu (useful to add hotkeys on existing/previous keyboard files)
Code cleaning