Topic: Research percentages.
Just a piece of info I picked up for those out there who might find it useful. I know the prols know all this. This is for the newer players out there.
When researching your maximum efficient target percentage is 70%.
This is because it costs for example 10,000,000 research points to get to 70% in a particular field. And then it would cost an additional 10,000,000 to bring that percentage from 70% to 90%.
That 10,000,000 research points would be best put into another area of research and bring that to 70%.
70% in this other field would have a greater impact on your empire than the 20% you could make investing in the one field.
Also note that it is a lot more cost effective to fund research once the expo phase is over and you have stabilised your Overbuild Percentage.
Also more effective to build Research Centers after this time. As these are the cheapest buildings. You get more efficiency when building last and reaching your top overbuild percentages ie 500%-700%.
Summary: researching 2 or 3 different fields is much more beneficial.
Funding or building research centers is more cost effective at the end of expo.