According to the Dell website the Inspiron 3593 supports Windows 11.
https://www.dell.com/support/home/en-us/product-support/product/inspiron-15-3593-laptop/drivers
https://www.dell.com/support/home/en-us/drivers/supportedos/inspiron-15-3593-laptop?ref=oscompatibility
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Computer lags can be multifactorial: operating system, drivers, BIOS, software, etc.
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There are third party software / websites that can test computer performance:
https://www.userbenchmark.com/Software#:~:text=Welcome%20to%20our%20freeware%20PC%20speed%20test%20tool.,identify%20hardware%20problems%20and%20explore%20the%20best%20upgrades.
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It is best to make free backup images so that you can perform trial and error steps.
(These are some third party software: Acronis, Aoemi, EaseUS, Macrium, Paragon, etc.)
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When Windows 10 is upgraded to Windows 11 there is a default 10 day go back period.
This 10 day period can be modified to 60 days.
Once the Windows.old that had been created during the upgrade is automatically deleted a clean install is required to return to Windows 10 unless there is a backup image.
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--Please don't forget to upvote and Accept as answer if the reply is helpful--
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