RStudio suddenly slow processing

Hi Team! since yesterday R version 3.5.2 (2018-12-20) is working very slow. I am running ENMeval and a command that normally takes 30 min (with 4 cores working) is now taking more than 100 min. I already added the Windows Defender exclusions suggested above and even turned it off but did not improve the performance of R.
I also installed new versions of R and Rstudio but nothing is working. Can you please suggest something else to try?
Thanks a lot in advance!