[Raymonf]

If I understand what you're trying to say correctly, I need to say that I'm speaking fully from a user experience standpoint as an end user. I am not a Tumblr engineer. Anecdotally, out of the few people I know that still use Tumblr, they use desktop and mobile Chrome to access the website. I don't have any statistics on how many people use the apps.

So, to me, Tumblr's website is already the main point of access, and these performance problems don't exist on Firefox or Chrome. I'm not talking about server-side response times, I'm talking about the time to render posts on the client. I find that a lot of times, after scrolling, you have to wait a few seconds before you see anything but the blue background that Tumblr has.

So, no, I'm going to pin it on Safari if (even) Firefox can deal with it.