True, timezone could be a biggie. Although in my case (GMT) is 1/22. Screen res is another possibility (1920x1080) = 1/28. All the site doesn't mention anythin

True, timezone could be a biggie. Although in my case (GMT) is 1/22. Screen res is another possibility (1920x1080) = 1/28. All the site doesn't mention anything about IP address on the report page and presumably doesn't have access to third party tracking cookies however so private browsing shouldn't make much difference (I cleared my cookies and got the same score).