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You could try deleting the shader cache (Documents/Paradox Interactive/Victoria 3/shadercache) and let it rebuild to save some disk space. For some users it can get as large as 10GB after multiple version changes. The normal size of the cache should be between 3 and 5GB.
Other than that, 10-20 GB is not enough free space for a 500GB SSD, especially if you expand the paging file. You should aim to have at least 10% (40-50GB) free.
