I am pretty good at this game, but far from Pro. Here is my strategy that will help do a CR 90% of the time on the first try:
Prep:
Identify the “BOOM” button.
Identify the generator skill.
Look for any mobility or toughness skills.
Move “BOOM” skill to the button you can easily manage. I use either “1” or right click.
Move generator (if there) to the second easily managed button. For me, the one I didn’t choose above.
If you are lucky and there is a movement skill or utility skill, remap those as you would normally.
Dump useless skills on buttons you most likely won’t press.
Gameplay:
run or walk (if no mobility) to the first elite or big pack of mobs, and hit/spam “BOOM”
now use mobility (if it is there) to move to next big pack or elite and hit/spam “BOOM”
rinse and repeat until you get to RG and then hit/spam “BOOM”.
as far as pylons, hit them as you find them.
Things not to do:
do not herd monsters. It is a waste of time.
do not waste time on small packs 2-8 monsters.
single mobs, definitely run past.
monsters that jump/fly around, ignore.
Definitely no to either of these. Tieing CRs to any range small range of difficulty is one of the major flaws of CRs and something that has plagued the game since launch. When you tie the end game content to a certain difficulty, you cripple build diversity. Set the range at 45-60 and you get the incohesive builds we get now. Set it at 140-150 and we get a limited choice of 10-12 builds to choose from. Set it at 100-115 and you get a solid amount of builds, but miss out on a lot of fun actually cohesive builds that won’t work in this range.
Again, the biggest problem with CRs is the lazy design and implementation from the start. I have already done this dozens of times since CRs have been introduced, but I will throw the quick version of how I think CRs should have been designed and implemented back in the day:
Build selection:
Once a year for a week long period, Blizz allows submissions of videos of build submissions from players. (theory crafters are now enthusiastic as they get to be part of the design process).
Blizz then spends a week to narrow it down to 10 solid submissions per class. (1-2 employees could easily knock this out in a week, and allows vetting out incoherent builds).
For a week, players are allowed to vote on their top 5 for each class. (Players get to be engaged and part of the process).
After voting, Blizz now has 35 builds for the year. The remaining 17 builds can be pulled from popular, established builds pulled from LBs (Standard set builds, top LoD builds)
CR play:
A exclusive set of maps is chosen for the run. (not random, everyone runs the same as now).
Gear, paragon, skills are from the build selected (same as now).
Players get to choose the GR difficulty, from 1 to 150 (now noobs aren’t overwhelmed and pros aren’t bored) (This also means coherent builds are ignored due to power).
The CR time to complete is 15 minutes (same as a GR).
Rankings are based on who cleared the highest the fastest (Just like GRs).
Rewards:
Each new CR, player gets a one time CR cache for every 10th level completed. (One is awarded at GR10, GR20, GR30, etc. If someone completes a GR80 off the bat, they get 8 CR caches. Now those who only want the CR for season start or Altar can run a GR10 and get it over with, while people who want to compete can keep going up the ladder).
At the end of the week, bonus CR caches are awarded for ranking on LB. 1 for top 1000, 5 for top 100, 10 for top 10 and 25 for the #1 spot. (This gives incentive to push that LB while the rewards aren’t big enough to feel mandatory).
I have the same build skills that the original runner had. The difference is, my skill (while nowhere near pro) is significantly better than most players who’s builds are chose for CRs. Many of these noob players will waste time killing every monster, chasing bugs around, going the wrong way because they have no map knowledge, die too much because they do not understand positioning, and/or they do not understand pylon management. Because of the above reasons, I can usually finish a CR in the 3-4 minute range, which 2-3 minutes ahead of time.