RStudio running abnormally slow for every action, including cleaning console and saving file.

My RStudio has been running super slow recently for every execution, even for loading a library or saving a file. Everytime I ran a command, feels like it needs to wait for connection for a long time. I've uninstalled and reinstalled it but still didn't work.
Please kindly help me, thank you in advance.
Both R and Rstudio are in the newest version.

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