Note that you should let the software do what it is designed to do. Most of those files you have shown are tiny KB and MB sized. You show one single GB file now. In the original shot the largest files were MB size.
What are your motion settings?
How much motion activity do you have?
How long are you retaining video clips for?
How many GB or TB of video data is stored?
As that last images indicates >800000 video clips, if I see that correctly.
If so, no wonder you'd have a bit of a database file to keep track of all those clips and the system runs consequently slower. The database will grow relative to how many data points and clips there are. Few files = small db. as you add more data, it grows. Completely normal.
That's not to say you can't have a bug or anything, but you may need to do a thorough settings review first.
And what are you recording? Motion in a commercial setting (supermarket, 24hr gas station, ...) or residential looking outside can be semi continuous motion where all the cameras record people walking through a store or see leaves and clouds move, and each time record 10sec clips, pretty constantly ... thats a lot of clips over the course of a day, week, month. So to keep the database and number of files smaller, longer clips or some changes towards more continuous recording on some cameras may be better.
