Nothing to magical here but just sharing a little tip on speeding up your play. There are a lot of rerolls around in 40K. One thing I like to do roll the reroll die at the same time as the normal roll die. This can essential cut the dice rolls down a ton. For example I often have a Predator with TL Lascannon and 2 heavy bolters in my mech list. So when I roll to hit I will roll 6 white dice and 2 red dice. White dice are the heavy bolter and the red are the TL lascannon. When I am picking up the dice to move on to wounding or armor penetration I just have to check both red. If they both miss pick both up if not pick one up since 1 hit and 1 miss or 2 hits both yield infact 1 hit. Same thing works for difficult terrain tests with dozer blades. Roll 2 dice as long as 1 is not 1 you are fine.
Now you might say that but the second die is final. That is way you can only use this trick on things where the result is either pass or fail with no penalty to get the die roll(Bosspole). If I passed the first roll I would not have rolled the second so the other die is ignored. If I failed the first then the other die is the pass. All the odds work out the same since the each dice roll is indepedent. If both dice succeed, I use my logic since I know I am limited to 1 success.
Now for scatter dice you do not want to do this trick since they are not purely pass/fail the numbers and directions matter.
This trick is great for those Vulkan buffed Thunderhammer Termis. Since the weapons are mastercrafted not Twin Linked you only get to reroll 1 miss each. So that means you have to roll each termi seperately. Roll three dice and reroll 1 miss on the charge. Instead just roll four dice and know that the max hits is 3.