I would be willing to bet if I put most of the people here making these claims in front of an already booted Win10 or Win11 machine that they're not intentionally trying to bring to its knees they'd have no idea whether it sported a spinner versus an SSD.
This is a prejudice, pure and simple. Even I prefer SSDs to HDDs, but the idea that Windows 10 or 11 just run miserably when one is the system drive is just not true. The difference is slight, not like night and day.
It's from experience of around 3,000 computers under our command at any time.
Most of our clients run MS Office apps. They're a bit heavier...Word, Excel.....larger spreadsheets. Oh...Outlook...on 365 mailboxes. Meaning, as any business mail account should be allowed to do, mailboxes are large....double digits in gigs in size.
Oh...and accounting apps, such as Quickbooks. Or...if some poor persons is tortured by being forced to run from a 7,200 rpm spindle..."Slowbooks". Just SHOOT ME NOW!
Business employees often utilize Windows Search. It's not bad on SSD. Stuck with a prehistoric spindle? May as well go wash your car, or take a lunch break...during that Search.
How about from a management/preventative maintenance perspective...
*Microsoft updates....reboots...you want to wait a few minutes..or 30 minutes to an hour?
*Updating Windows 10 major releases...such as shoving in 21H2. Personally I'd rather get it done in 20 minutes versus 480 minutes...but hey, it's a free country. I do most of that work outside biz hours, and I value my after biz hour time. If this is a billable job, adding those hours...may as well have sold them a new computer!!!
*Daily antivirus quick scans...thanks to SSDs doing quick scans really makes things unnoticeable to the end user. But back in the spindle days...we'd often get complaints...especially on spindles that were a couple of years old...as it's well known that as spindles age and get wear and tear, (higher mileage)...they slow down. SSD's...not really.
But most of all.."Why still a spindle?" Really...prices of SSD's are so_dang_cheap now. So is RAM too! I just don't get allowing spindles...or 4 gigs....or old Pentium DUO processors these days.
On the amount of time the OP has spent trying to work on this computer already....on his bench...and posting this thread, and trying this, and trying that. Add all that time up...and be honest. Now..what's the OPs billing rate?
I could have taken the patient computer, listened to the complaint of "slow performance"...looked at the system specs and quickly found that it's a spinner...I would have gone directly to (without passing GO)...cloning to SSD. Spend 5 minutes hooking the drives up to our drive duplicator...let it cook while doing lots of other things, returned in about an estimate 30 minutes...til it's done, put the SSD in, booted up, rebooted...and I have about 15 minutes time invested in this computer.
*I'll guarantee it runs a heck of a lot quicker
*Client will be a heck of a lot happier
*In the past, spindle hard drives were generally the first part of a computer to fail, and they get slower over time. SSDs...generally live as long as the rest of the computer now, under average use..and don't noticeably slow down over time.
My bill to the client would have been for 1x hour of bench time, plus the price of the SSD....a very small bill.