Why would a reset help here? the performance difference is vey clear when switching back /forth, this has nothing to do with LAN / wifi performance, it's the WAN side that's slower. maybe the test involves multiple resolve requests, I don't know, but it severely affects the test. just go to speedtest.net and see for yourself.
Yes - I myself, and many others, have been using DNS-over-TLS since it was first introduced in one of the Asuswrt-Merlin BETA's - with ZERO impact to performance as measured by:
- speedtest.net
- dslreports.com Speed Test
- FAST.COM (Netflix speed test)
Therefore there's something unique to your setup / ISP / geographic location* which is causing the anomaly.
*Note: it's possible the speed issue you saw has nothing to do with DoT, but is related to Cloudflare DNS vs your ISP DNS.
Perhaps when you use your ISP DNS, you are directed to a speedtest.net site which is very close to you.
And when you use Cloudflare DNS, you are directed to a speedtest.net site which is farther away (i.e. slower).
So, that may be a fault of using Cloudflare, not using DoT.