Seriously 30% performance drop is too much for a storage drive? Have you never used rotating disks singular or in RAID?
Forgive me if this sounds like "get off my lawn" or "when I was a kid I had to walk through snow uphill both ways
" but I've literally seen hard drives slow enough that defragmenting them took days. I'm not joking, I'm not exaggerating. Literally I had to disable screen saver and standby and had to literally check on the system and run the defrag multiple times before the defragment was sufficient.
Take a look a HDTune or HDTach graph and look at how much performance drops from the first 10% of the drive to the last 10% of the drive. I've seen drives that look like a ski slope they drop off so bad. Take this 640GB drive for example:
Just doing a quick bench you can see that it drops from 117 to 59 well more than a 30% loss and that is before you take fragmentation into account. It's just physics. And that isn't a bad example. I've done benchmarks on old rotating disk drives that the end of that slope was in the single digits. If you didn't short stroke it the last 30% or so was practically unusable from a performance standpoint.
And you do know that some SSDs become just completely unusable if you torture them properly. Not just a little slower but like don't reboot or you may not have the patience to wait the nearly indefinite time it'll take to ever access the data on the drive.
Anything a SSD manufacturer does to make a drive faster will either allow performance to drop after data is recorded or will reduce the accessible capacity of the drive (changing the price per usable GB). If you have plenty of money to burn you can fix these sorts of problems by massively over provisioning your SSD or if you don't have that much money just do it a slight amount (very similar to short stroking a hard drive in effect but not for the same reasons). Just google "SET MAX ADDRESS" and be prepared to back up and restore any data you have on the drive.
1. Backup data
2. Set max adress to make the drive appear smaller than the sticker on the drive says. Say 50% on the drastic side or a more reasonable 80% of advertised capacity or somewhere in between.
3. Secure erase the drive
4. Quick format
5. Install OS and/or restore data
6. Watch as your newly reduced capacity SSD is more resistant to slowing down when you benchmark writes. Not immune, just more resistant. (Disclaimer the improvement will vary by controller, This works well on Intel SSDs I don't know exactly how well it helps a Sandforce drive).
If you don't accept that some small drop in performance is unavoidable the only way to do that would be to set an artificial cap in performance and throttle the drive so you wouldn't notice the difference between perfect performance and the unavoidable drop. Of course then you'd complain that drive X that is throttled doesn't perform as well as Drive Y that isn't throttled.
The only real difference is with Hard Drives the synthetic benchmarks ignored fragmentation and with SSDs benchmarks highlight it (due to the differences behind the scenes). With either type of drive the real world performance drops with certain usage patterns.
I'm not saying you can't do anything to improve that performance. I'm not saying you can't complain. I'm just saying please don't wail if someone says hey that might be normal or I'm not sure if that's enough of a problem to complain about.
Pay no attention to the man behind the curtain.
I've got to go walk uphill both ways some more.
Now where did I put that monkey