When the GPU or CPU load is very high (red strip on the indicator panel), you cannot avoid drops and clicks.

I'm not sure what is the bottleneck in your case. You can try with a stronger graphics card.

Are there any tools or methods in aximmetry to identify the cause of bottleneck of gpu/CPU?

Just watch the indicators on the Processor Load panel if any of them are red.

What framerate do you use? And which scene do you experience this problem with?

In this case the system runs at 50 fps. Also the data uploading of the inputs takes some time from the GPU.

It means that your GTX 1660 probably can be a bottleneck. We usually recommend at least a GTX 1080 for this type of usage.

Regarding the CPU:  which model of i7 do you use?

are there any suggestions for media file codecs?

Also Are there any options to increase the priority of processing videos and audio over other things?

maybe an option to cache some of elements on disk.

finally i wish of there any performance monitoring tool for example like this one

https://docs.derivative.ca/Performance_Monitor

The problem is not the video/audio processing, but that the system cannot finish the render of a frame in time.

If you have a good CPU video decoding is not a problem.  But if there is a frame drop because of the rendering overload the audio output will stutter as well.

Could you give me a specific example?

I think that studio library example files like news studio have better performance in 2019.2.x than 2019.3.x one

There was a change in that scene, indeed.
The same mirror image was used for both ground levels in the scene which is incorrect, and we've fixed it.

Upon this we did not experience any performance drop on our hardwares, but it's possible that it affects your one.

Could you try the following:

Enter NewsRoom-Studio-Preset-Mode 1  with an Alt + double-click.

Enter Studio with a double-click.

Find the to MIRROR modules.

Select MIRROR-2 and change the From Tunnel property to MIRROR-1.

Could you report back to us if this restore the previous performance?
Thanks.

i think that i was old version  of the  project with aximmetry 2019.3.x after updating the project to current version i have better performance of old one with default configuration

Sorry, can you clarify this a bit more.

A)  you tried with the same software version,  but different versions of Projects

or

B) you tried with the same Projects,  but different versions of software ?

Sorry I meant same software version,  but different versions of Projects

Ok, thanks.  In this case my previous answer is valid.  Please try what I suggested.