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1/ first boot always takes longer due to db initialization, odexes creation etc 
2/ you didnt mention, but it's strongly discouraged to enable gapps/gms updates (even on 1gb/2gb boards), due to higher resources usage 
3/ with proper app selection you can get smooth android even with 512M of ram (beware of things that run in background and/or access disk a lot) 
4/ high 4k block random r/w sdcard is recommended (class a1/a2) 
5/ h3droid based on nougat is in the works but put on hold due to technical problems (and lack of time/motivation) 
6/ h3droid based on kitkat is quite usable, stable, slim and fast (just dont install everything and know what you are doing. 
7/ one idea i havent tested yet is having /data partition on fast ssd. but again, lack of time. |   
 
 
 
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