Edge is slow especially with PDF's
Step 1: Clear Cache.
Your browser automatically saves temporary Internet files to help pages load faster. Clearing this cache will sometimes fix page display problems.
Open Microsoft Edge and click on the (…) dots > select History > Clear Browsing data > check the box beside and Cached image and files, Browsing history, Cookies and other site data > then select Clear now.
Step 2: Disable Extension
If you are using extensions, sometimes it loads or enables when Edge launches after a start/restart. You can disable them and check if any of the extensions may affect browser performance.
Open Microsoft Edge and click on the (…) dots > select Extensions > toggle the switch to Off for all the extension present.
If disabling the extension fix the issue, then toggle each or a group of extension to ON and check.
Step 3: Disabling the hardware acceleration in Edge.
1. Open Microsoft Edge
2. Click on the three dots (…) from the right top corner.
3. Select Settings from the drop down and click on System from the left pane.
4. Toggle the switch to Off for Use hardware acceleration when available.
5. Relaunch Edge and check.