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Xlsx files - slow opening in Thunderbird

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For some reason thunderbird opens .xlsx files very slowly for me. After clicking on the open button usually 15-25 sec passes until the file opens (even with small files). As I can see this behaviour has nothing to do with the program managing the xlsx files, since the result is the same with M$ Excel and with libre office as well. All other attachments are opening immediately. Tb is up-to-date (, the mailbox is just a regular address used with pop3. I checked this issue from a clean W10 install, where the result was the same.

Please advise.

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