What can be the reason for the slowdown of the SSD drive?

Question

Solid State Drives

In general, the situation is this, after reinstalling WIndows on an SSD drive, the system began to behave strangely, namely, it freezes periodically. After a little investigation, I realized that this is a problem with the SSD drive on which the system itself is installed directly. On this screen you can see the moment of "sagging". Moreover, no program loads the disk to these same 100%. That is, according to the resource monitor, the disk is loaded at 100%, but in the manager, which displays the load of programs directly, the disk is loaded at ~ 50% and no program uses it 100%. I've looked all over the internet but haven't found a solution. I ran various programs like "Victoria" and "HDD Scan" on broken sectors - not a single broken sector. I also did a chkdsk check - no results. I thought the problem was in Windows itself and its updates, but for the sake of experiment I decided to install WIndows 7 on the SSD and the problem persisted. I also changed the SATA cable directly, still the freezes did not stop.

Answer 1

Apparently - the degradation of the write speed, due to the lack of free cells.
TRIM does not work, or the garbage collector simply does not have time to process tasks due to a small amount of disk space, or a small reserve.
The drive is far from the best - the company assembles SSD from whatever it takes, and does not have established models.
That is, within the same model, there may be options on completely different controllers with different characteristics.
It is better not to buy such discs at all, try to take well-known brands.
If you already bought - leave a decent Over-Provisioning - that way 15-20GB.
Make sure TRIM is working.
Do not clog the disc to the eyeballs.