Are these not normal speeds for an SSD? Carry in the guarantee?

Question

Solid State Drives

Sandisk Ultra II 120gb. A couple of days ago my computer started freezing like hell. All suspicions on the disk. Screenshot of speed measurement. ibb.co/cb1EvQ sorry for this link, I'm on a phone, it's hard to even ask a question from a computer
Don't pay attention to the fact that the disk is empty, I measured it on a friend's computer, and the disk was formatted

Answer 1

An SSD, unlike a HDD, does not write information immediately.
It requires a SEPARATE erase operation.
If TRIM works fine for you (and for this you must have a modern OS and a modern controller and a modern SSD), then the diligence operation occurs automatically and does not take time when writing.
If something is wrong with TRIM, then the recording essentially turns into a double recording (before recording, an erasing operation is immediately launched, which is the same in time as the recording) - that is, the recording speed drops by half.
The same problem will be if the disk is largely filled with data, and recording is intensive. Then TRIM simply does not have time.
You have more or less normal speed. There are SSDs and faster. But this is not the worst option.

Answer 2

Speeds are normal for an SSD. Perhaps the matter is in the disk, but then the scan must be done by filling it with copying and monitoring the process.
Perhaps in the controller on the motherboard - then you need to carry out such tests on two motherboards.
And by the way, both for writing and for reading. To understand exactly where the friezes occur.
Maybe your processor is throttling due to overheating?
Or a virus is caught and someone is mining cryptocurrency on your computer.