Virtual Instrument cause Duet input latency soar

[whsi]

Hi,

I have been using duet for 3 years.

But the input latency increases sharply just after I load some virtual instrument.

Both input and output latency of buffer size of 64 is about 3.0X ms.

After loading only one virtual instrument, especially sampler with some memory load, the input latency jump to over 7ms. The most extreme time it is higher than 14ms. But the output latency remains 3ms.

This is not caused by lack of memory. I am using the same pc, and the same VIs.

I have tried to reinstall all the versions of drivers, and update the firmware with no success to solve the issue.

Please help me.

Thanks

PS: my memory is 32GB, and os is Windows 10.