If your Windows 11 PC feels slow, takes longer to boot, transfers files slowly, or takes too long to open apps, it may be due to a slow SSD. There are several reasons an SSD can become slow. In this guide, we’ll learn how to restore the health and speed of an SSD.
Low storage space, disabled write caching, thermal throttling, TRIM not enabled, and outdated SSD firmware are the most common reasons for a slow SSD and, therefore, a slow Windows 11 PC.
Reasons and Fixes for Slow SSD Speed on Windows 11
Step 1: Free Up Storage Space on SSD
Your SSD should have at least 10–20% free space. Because it erases and rewrites data in blocks, a nearly full drive gives the controller fewer empty blocks to work with. This leads to more write amplification and slower write speeds.
By removing unwanted applications, large videos, game libraries and other unwanted things from your Windows 11 PC can free up storage space. Also, enable Storage Sense to remove temporary files automatically.
Step 2: Enable Write Caching for SSD
Write caching stores data temporarily before saving it to the drive, which makes your computer feel faster and more responsive. Windows 11 often turns this off for USB drives to prevent data loss due to sudden power loss.
To enable write caching, open Device Manager > Disk drives > right-click SSD > Properties > Policies > Enable write caching on the device > click OK.
Warning: Write caching can cause for data loss on sudden power loss. Use UPS for critical systems.
Step 3: Enable TRIM for SSD on Windows 11
TRIM tells the SSD which blocks are no longer in use so the drive can erase them in the background and maintain write performance. If it is not enabled, an SSD will slow down.
To enable it, open Command Prompt as administrator, type fsutil behavior query DisableDeleteNotify and press Enter.
If you get “0” it means TRIM is enabled. If it is “1” TRIM is disabled.
To enable TRIM, execute the command fsutil behavior set DisableDeleteNotify 0
Important: If you do not have enough space on SSD, TRIM cannot help you fix slow SSD.
Steps 4: Update Your SSD Firmware
Manufacturers release firmware updates that fix bugs and improve how the drive handles wear and performance. Outdated firmware can cause slowdowns or instability.
First, download and run your drive maker’s tool, such as Samsung Magician, Crucial Storage Executive, Intel Memory and Storage Tool, etc.
Check the firmware section and follow prompts to update.
Step 5: Fix Thermal Throttling
NVMe SSDs can get hot during heavy use. When they overheat, they automatically slow down to protect themselves from damage, which you'll notice as a sharp drop in speed during large file transfers.
You can check the drive’s temperature with tools like CrystalDiskInfo. If it’s getting above about 70°C, it may start throttling.
To help cool it down, add an M.2 heatsink, use a motherboard with a built-in M.2 cooler, improve case airflow and add a small fan nearby.
Step 6: Check SSD Health & Total Host Writes
SSDs don’t last forever because their memory cells wear out over time. As they wear, the drive can get slower and eventually fail, so it’s good to catch problems early.
To check your SSD’s health, install CrystalDiskInfo or your SSD maker’s tool and open it. Look at the Health Status and Total Host Writes, then compare the writes to the drive’s TBW (terabytes written) rating.
If the health drops below about 70–80%, or the writes are getting close to the TBW limit, back up your files and start thinking about replacing the drive.
Final thought:
A slow SSD can often be fixed with a few simple checks, but if the drive is worn out, replacement may be the best long-term solution.
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