The default latency timer for serial drivers is often 16 ms. For CNC or 3D printing, this causes stuttering. To reduce it:
Open Device Manager. Under “Ports (COM & LPT),” you should see “XH190 Serial Device (COMx).” Open a terminal emulator (e.g., PuTTY) at 115200 baud, 8N1. Sending +++ should return an OK if the firmware is responsive. xh190 driver
If the dedicated driver fails to load properly, the system may fall back on generic legacy protocols. For instance, high-speed interfaces might downgrade to slower default USB 2.0 speeds. The default latency timer for serial drivers is often 16 ms
