4 ms·

Firefox has some weird slowness with DNS that I have troubleshot to death. I still use it for almost everything, but sometimes I'll have an entire day of 30s pa

Firefox has some weird slowness with DNS that I have troubleshot to death. I still use it for almost everything, but sometimes I'll have an entire day of 30s page loading times.

recursive 2y ago
Apologies if this is elementary, but have you tried turning off DoH? https://support.mozilla.org/en-US/kb/dns-over-https#w_off https://support.mozilla.org/en-US/kb/dns-over-https#w_off
- edoceo 2y ago
  I put this setting in ages ago on my FF profile and haven't seen DNS lag. My biggest DNS lag was before I used PiHole and was relying on my router, which upstream to 8.8.8.8. I've just assumed that little thing was overloaded or that Comcast was just having a "hiccup".
- jamesgeck0 2y ago
  I see glacial DNS resolution regularly when hitting the AWS authorization page with DoH disabled on my company's VPN. Resolves instantly in Chrome.
  - joecool1029 2y ago
    This is almost certainly a fragmentation issue caused by lower MTU and broken path MTU on the VPN. Drop the system to 1280 to troubleshoot, if things work immediately there's the culprit, raise it up til it doesn't or don't, I keep my VPN's at 1280. EDIT: I do not know why its an issue with firefox and not chrome, it's likely QUIC fucking up since it cant fragment and needs to fall back to TCP, chrome is probably error handling this better... dropping the MTU that low will make the fallback explicit: https://blog.apnic.net/2019/03/04/a-quick-look-at-quic/ https://blog.apnic.net/2019/03/04/a-quick-look-at-quic/ EDIT2: Could also try disabling QUIC, instructions here: https://developers.cloudflare.com/cloudflare-one/policies/gateway/http-policies/http3/ https://developers.cloudflare.com/cloudflare-one/policies/ga...
Yeul 2y ago
I wonder how much time not experiencing advertising on the internet saves? Whenever someone says how fast Chrome is I think about this.
guappa 2y ago
Disable DNS over HTTPS I guess.
Underphil 2y ago
Same here. Tends to be pretty inconsistent. DNS-over-HTTP(s) definitely disabled. 30s is a lot more than I've experienced, but there are times where it clearly struggles to look things up.

Firefox has some weird slowness with DNS that I have troubleshot to death. I still use it for almost everything, but sometimes I'll have an entire day of 30s page loading times.

recursive 2y ago

Apologies if this is elementary, but have you tried turning off DoH? https://support.mozilla.org/en-US/kb/dns-over-https#w_off https://support.mozilla.org/en-US/kb/dns-over-https#w_off

edoceo 2y ago
I put this setting in ages ago on my FF profile and haven't seen DNS lag. My biggest DNS lag was before I used PiHole and was relying on my router, which upstream to 8.8.8.8. I've just assumed that little thing was overloaded or that Comcast was just having a "hiccup".
jamesgeck0 2y ago
I see glacial DNS resolution regularly when hitting the AWS authorization page with DoH disabled on my company's VPN. Resolves instantly in Chrome.
- joecool1029 2y ago
  This is almost certainly a fragmentation issue caused by lower MTU and broken path MTU on the VPN. Drop the system to 1280 to troubleshoot, if things work immediately there's the culprit, raise it up til it doesn't or don't, I keep my VPN's at 1280. EDIT: I do not know why its an issue with firefox and not chrome, it's likely QUIC fucking up since it cant fragment and needs to fall back to TCP, chrome is probably error handling this better... dropping the MTU that low will make the fallback explicit: https://blog.apnic.net/2019/03/04/a-quick-look-at-quic/ https://blog.apnic.net/2019/03/04/a-quick-look-at-quic/ EDIT2: Could also try disabling QUIC, instructions here: https://developers.cloudflare.com/cloudflare-one/policies/gateway/http-policies/http3/ https://developers.cloudflare.com/cloudflare-one/policies/ga...

Yeul 2y ago

I wonder how much time not experiencing advertising on the internet saves? Whenever someone says how fast Chrome is I think about this.

guappa 2y ago

Disable DNS over HTTPS I guess.

Underphil 2y ago

Same here. Tends to be pretty inconsistent. DNS-over-HTTP(s) definitely disabled. 30s is a lot more than I've experienced, but there are times where it clearly struggles to look things up.