Lightroom 5.5 update unusable:(  I downloaded the 5.5 (not CC) update yesterday

Lightroom 5.5 update unusable:(  I downloaded the 5.5 (not CC) update yesterday on my PC and now most functions are EXTREMELY slow to the point of making Lightroom unusable. It takes several minutes and appears to freeze when cropping an image, an export of a single image takes several minutes, and every click or action of any sort takes 10-20 seconds to respond. I didn't have any problems with the 5.4 version and would like to go back to that. My questions are: 1. How do I get back to 5.4? (do I just uninstall 5.5 and reinstall 5.4? and in that order?) 2. Will going backward mess up my catalog? Will I lose all of the work I've done since my last backup? (sadly, last week...arg!) 3. I also updated CS6 Camera RAW...if I go back to LR5.4 do I also need to go backward in Photoshop updates?
I've got 3 projects that require Lightroom and need to get done (like yesterday!), so any help you can provide would be great.
Thanks in advance!

Just re-install Lightroom 5.4; you lose nothing.
You do need to make regular backups (weekly or more frequently) regardless of this issue.

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