Printer really loud

Hello, I am facing a really strange thing with my VCore 3.1
Its making a lot of disturbing sound especially in lower speeds (first 2layers).
And most of the times If I speed up my print to 150% speed factor the noice is getting bette.
I did try more belt tension or lower belt tension but it didn’t help… anyway I am not sure that my tension is actually correct and I couldn’t find any clear info on this

Here is an example below:
Thanks
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