Hawk questions

[Lit Hawk]

So in the mornings when I take my hawk to work the first street I hit the speed limit is 45. For some reason the bike acts like it doesn't catch and just kinda revs at about 35mph. I have to just cruise for about 5 min and then it'll start riding normally and it'll let me go faster than 35-45 mph. Is this normal to do this on initial warm up it doesn't seem to do it in the evening when I leave work. Just in the morning. My second question is I take my bike in the mud quite often and usually wash it right after. What should I do about my chain after I wash it? Usually I'll wash the bike and just spray the chain with wd-40. I would like to just wash the bike and that's it but it seems like I should be taking the chain off and soaking in lube. What do y'all do about cleaning chain?