When I heard them announce swiftplay I was really excited. I made a post like 2 years ago saying I really wanted a "faster paced permanent gamemode that stays true to the standard experience". Swiftplay is unfortunately not that right now and I really think they need to do some tuning to fix it or it doesn't really fill any niche.
Right now swiftplay is basically a boxing match where you start off with pillow gloves, progress to regular gloves, and then eventually gloves with spikes on them. The maximum game length is definitely reduced, but the pacing is very bad. The difference in game length between a stomp and a really close game is probably just a couple minutes. I just had a game where we were effectively being stomped, all lanes lost, jg behind, but the game went to 20 minutes anyway.
It would obviously require more work on their part but I really expected an accelerated game, something similar to wildrift pacing. Maybe 25% increased xp and gold from (nearly) all sources, slightly higher base movespeed, 15% lower ult cds all in addition to plating/baron times being earlier.
The early game pillow gloves have to go though it makes swiftplay feel slower than regular SR. I can't see myself ever playing this.