there is a weired bug where adding fx to audio or vst tracks adds the latency of the added plugin on a global level. so midi input becomes sluggish pretty fast. this was not the case before cubase 8 . with earlier versions (sx - 7.5) i was able to add fx up to the last cpu cycle and the latency …

vst(i) latency issue

steffenb April 11, 2016, 10:39am 3

i think its safe to say that this problem
is easily connectable to all this issues

render in place bug

extra audio length on export

export audio progress bar not working

vst(i) latency issue