I tried in windows to benchmark my SSD and got 550mbps their however in endevouros it is almost half to it. Previously on debian I got the same results.
Welcome to the forum! 
The TRIM operation might help if you haven’t done that lately:
sudo fstrim /
Thanks for greeting​
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I’ve got trim and it’s scheduled to occur once in 3 days… but this doesn’t fix it.
I also tried in debian, pop-os, I got same speed their
And also tried generic linux kernel, xanmod, zen, no results
Btrfs?
Rsync
Rsync is not a filesystem.
Running fstrim more than once a week on an ssd is not recommended, as it wears out the ssd quickly. See Arch man-page.
Same goes for too much performance-testing. 
This isn’t suitable for btrfs, but for ext2/4 file system.
But I don’t use it…
???
I meant to say I use ext4
Oh, ok!
There could be many reasons… like the following just to mention a few:
- disk or partition nearly full
- SSD wearing out
- SSD firmware outdated
- motherboard firmware outdated
- slower than necessary filesystem
Also too little RAM with heavy RAM and/or disk usage can easily slow down a system.
Especially if this is a disk problem, it is recommended to backup all your personal data before doing anything else. Then examining the system further is safer.
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Ohh, what should I do then, I have 16gigs of ram, i5 3470, and I bought SSD 15 days ago. I’ve got good speeds on windows though, and I checked for updates but all are up to date, I am happy with 250mbps+
Nice, which partition table btw?
That’s somewhat older. Does your motherboard support SATA 3, because if it’s only SATA 2 that would explain the speed difference.
Yeah it supports, and it’s i5, and I do get speeds over 550 Mbps in win, other wise it doesn’t bother me, but the same thing getting better speed in win makes me enquire about
Yeah it supports, and it’s i5, and I do get speeds over 550 Mbps in win
Ok, so this is on the same PC. Well, I also just noticed that I have MX500, not BX500 
but I don’t think that explains a 2x difference. I tested ext4, xfs and btrfs (but not as boot drive), all are fine.
I would check just to be sure, what does smartctl -a /dev/sdX | grep -i sata say as SATA version.
Keeping sata thing aside… the same thing in win better speeds while in linux only half…
Welcome,
The power management level can have an influence on the performance :
sudo hdparm -B /dev/sda