I notice that you can build up some research time before picking a tech.
However each day tick also reduce how much time penalty (50% extra cost if the tech is still 6 month away as an example).
So I was wondering is it best to stack research bonus from electronic tree and wait until that year to start work on tech? Or just start work on it and ignore the penalty?
There are some tech that can be a "huge game changer" like infantry equipment 2 that make it worthwhile to ignore penalty a bit. However there are some tech that you may want to rush but comes with huge penalty like nuclear tech in the 1940s.
Basically what is the best way to min-max research speed?