ZXMAK2 v2.8.4.37878 Beta is released. ZXMAK2 is plugin based ZX Spectrum Virtual Machine. On the other side, this is flexible ZX Spectrum emulator. Project written in C#. Currently it works on Windows platform and using Managed DirectX.

Support the following ZX Spectrum clones:
- ZX Spectrum 48 (later model contended memory)
- ZX Spectrum 128 (later model contended memory)
- Pentagon 128
- SCORPION 256
- ATM 450
- PROFI 5xx
- QUORUM 256
- Leningrad 1
- Other (through custom configuration and plugins, for example LEC mod)

ZXMAK2 v2.8.4.37878 Beta Changelog:
- fix multi-display fullscreen;
- render video/sound performance optimizations;
- fps monitoring optimizations;
- added Time Sync (time based frame synchronization);
- improved VBlank Sync
- reworked View settings menu (added menu "Frame Sync Source" and "Video Filter");
- reduce CPU usage for Time sync;
- reduce CPU usage for VBlank sync;
- code refactoring (CPU, Engine, Circuits, HDD emulation).

The most significant feature of this release is dramatic improvement of the emulation performance and quality of the sound and video synchronization.

Download: ZXMAK2 v2.8.4.37878 Beta
Source: Here