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Fastmail's web UI has a really annoying bug on macOS Safari where it locks up the browser tab burning 100% CPU, and the only way out is to close the tab. Happen

by pavlov 6y ago

Fastmail's web UI has a really annoying bug on macOS Safari where it locks up the browser tab burning 100% CPU, and the only way out is to close the tab. Happens to me roughly every two days. I wish I had some steps to reproduce it, but it just comes up randomly when clicking on messages. I like the web UI, but if a desktop mail client crashed this often, I'd have deleted it long ago and switched to a different program. With webmail I don't have that choice.

telesilla 6y ago
>Happens to me roughly every two days If I were their dev I'd suggest first, use another browser for your sanity and second, get in touch with the support team to see if you can help improve it!
- brongondwana 6y ago
  That's precisely what I was about to suggest. Here's what one of our devs just said on seeing this comment: > "This is the first I’m hearing about this — would it be worth it to respond and ask the user to reach out to support?" So yeah - please do contact our support team (support@fastmail.com or you can use the web form at https://www.fastmail.com/support/ https://www.fastmail.com/support/) and give as many details as you can about what you're doing when it happens!
  - pavlov 6y ago
    Thanks! Next time it happens, I'll save an Activity Monitor process sample (pretty much the only way to get any insight into a locked-up Safari tab) and send it to your support.
pmoriarty 6y ago
"With webmail I don't have that choice." Through a web browser is not the only way Fastmail offers to use its services. It also supports IMAP, so you could use any IMAP-supporting mail client (which is probably all of them). Also, while you're waiting for them to fix this Safari bug you could try using a different browser.
- pavlov 6y ago
  I could just go back to using IMAP (which I did for 20+ years), but for me the whole point of switching to Fastmail was to have a good webmail that's not tied to Google. I'm sure they'll fix the Safari bug eventually, I'm not worried about that. It's just an illuminating example of how difficult it is to create high-performance web apps that actually work in more than one browser.
  - csomar 6y ago
    Could it be a Safari issue, though? I'm using Fastmail with Firefox and it's quite snappy. No CPU issues.
jtth 6y ago
This does not happen to me and I have used Fastmail with Safari for seven years. Could be an interaction with an add-on? You also might try beta.fastmail.com.
- pavlov 6y ago
  No add-ons, just out of the box Safari 14 on Big Sur. Out of curiosity I once did a process sample with Activity Monitor from the crashed tab. Looked like WebKit was stuck in a text layout loop.

by pavlov 6y ago

telesilla 6y ago

>Happens to me roughly every two days If I were their dev I'd suggest first, use another browser for your sanity and second, get in touch with the support team to see if you can help improve it!

brongondwana 6y ago
That's precisely what I was about to suggest. Here's what one of our devs just said on seeing this comment: > "This is the first I’m hearing about this — would it be worth it to respond and ask the user to reach out to support?" So yeah - please do contact our support team (support@fastmail.com or you can use the web form at https://www.fastmail.com/support/ https://www.fastmail.com/support/) and give as many details as you can about what you're doing when it happens!
- pavlov 6y ago
  Thanks! Next time it happens, I'll save an Activity Monitor process sample (pretty much the only way to get any insight into a locked-up Safari tab) and send it to your support.

pmoriarty 6y ago

"With webmail I don't have that choice." Through a web browser is not the only way Fastmail offers to use its services. It also supports IMAP, so you could use any IMAP-supporting mail client (which is probably all of them). Also, while you're waiting for them to fix this Safari bug you could try using a different browser.

pavlov 6y ago
I could just go back to using IMAP (which I did for 20+ years), but for me the whole point of switching to Fastmail was to have a good webmail that's not tied to Google. I'm sure they'll fix the Safari bug eventually, I'm not worried about that. It's just an illuminating example of how difficult it is to create high-performance web apps that actually work in more than one browser.
- csomar 6y ago
  Could it be a Safari issue, though? I'm using Fastmail with Firefox and it's quite snappy. No CPU issues.

jtth 6y ago

This does not happen to me and I have used Fastmail with Safari for seven years. Could be an interaction with an add-on? You also might try beta.fastmail.com.

pavlov 6y ago
No add-ons, just out of the box Safari 14 on Big Sur. Out of curiosity I once did a process sample with Activity Monitor from the crashed tab. Looked like WebKit was stuck in a text layout loop.