Yeah, the update killed it for me, I still use my gmail address, but started using Spark as a client.

In case you haven't noticed it (it doesn't really stand out), when the page first loads, down at the bottom right there'll be a "Load basic HTML" link that gives you a lighter-weight version. & then you can set that as your default. The main version really is painfully heavy...

Google Inbox has had a similar issue recently. If I open it on my home laptop in the evenings, it'll load the contents, but none of the icons; it'll then spin on loading for ever and ever, and the UI remains unresponsive. Disk will be crunching as if it's working on stuff, but it never finishes. If I try again hours later, it'll work fine.