Lightroom 6.7 slower than 6.6.1

I've seen reports about the LR 6.7 performance problem on MacOS but it appears that there's no discussion about the LR 6.7 performance in general when compared to 6.6.1, as discussed here:

https://forums.adobe.com/thread/2212270

For me, the degraded performance of LR 6.7 was reason enough to downgrade to 6.6.1

Thanks
Alexander.