NitroPack and HTML code

Hello,

I wanted to test NitroPack and after I installed it, my score on page-speed grown up to 99 points~ and site going much faster but HTML code grown up from 154k(characters before nitro) to 250k(after installed). My question is – Is it normal? Cuz i saw sites that using Nitro and have only around 80k ch. of HTML. So im doing smt wrong or?