I don't see how the new build should be slower.
Here is a link to older build 650
If you want you can install on top of 652 (no uninstall needed) and see if it behaves the same.
i used this program before, and was able to do +30k high res pictures in a less than a day. for some reason
now i'm only able to download ~900 in 100 min. Just wondering if any one else has this issue or just me?.