I haven't had a slow down like that, But I do notice with 7DB..It is taking long for the files to show up.
Your issue sounds like a lack of disk space, memory or something along that line? It might not be a bad idea to reinstall C1.
I was having issues with C1v5 or v6.0 sometime back, as 3.78 was very fast and without a hicup. I either got used to accepting it, or later versions helped speed it up with updates?. I think my posts about the timing is in some thread with details about how many seconds. If I'm not mistaken, C1v3.78 was about 6 seconds, and C1v6(or5) was 11 or 12 seconds. This may sound like a short time, but in the scope of things, it is very slow. I was using the CapturePilot with the iPod and was able to show the file much faster using v6. I don't know what this 7.02 upgrade did to C1v7, but my system has had issues since the upgrade. I tried to include some Win764bit updates also, without success. My trouble started when I shot with C1v7, then edited with v6. It could be something else, so I submitted my report to C1. I don't think they get in touch, but they likely speed up a patch file in the next update.