I had many tabs open in several windows. At some point, I decided to close the extra ones and started closing the tabs one by one. The first one closed instantly, and after closing about 10-20 tabs, the next one closed for about 10 minutes on a powerful computer! All MX windows, at the same time, hung. Other programs, at the same time - worked fine. What can MX do when closing a tab?
Ver. 7.1.6.1500(64bit), portable. However, I have observed this behavior in previous versions as well.
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It seems that it happens when I closed all the tabs of one window, then closed the empty window itself, and then started closing the tabs of another window.