Inb4 "analytics" is a bad word in the fediverse, understandably so, but I ask because for one of the communities that I moderate, I noticed the banner image and icon image were nearly 20 MB each, so I replaced them with smaller versions (<1 MB each). On desktop w/ a fast wired connection, it's no biggie, but it's good practice anyway to minimize page weight, if for no other reason than to make the site more usable for people on slow or cellular connections.
I tried searching for traffic data about Lemmy, and the best I could find is this page on similarweb.com, which shows traffic broken out by country and referrals, among other things, but a breakout of mobile vs desktop appears to be locked behind a paywall.
Do we have any analytics on mobile vs desktop traffic for Lemmy?
Why are you assuming a desktop user has a fast connection?
There's still millions of people on slow ADSL/DSL connections, satellite, fixed wireless, and so on.
Don't use 20mb images when 100kb ones will suffice, good lord.