It’s a toss up. Snort is on the cutting edge for browser based, uses gossip model for relays, etc. I found disabling the image proxy or running my own helped - I think Kieran’s gets pretty slammed.

Iris is very clean but lacks emojis and a few kinda common sense things since the redesign.

Primal is nice, but I don’t like the way the feed works. That’s just subjective opinion though. It seems to function well.

I have one in the works written in Blazor Webassembly but it’s early days.

satellite.earth is nice. Have you tried it?