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What is the method to find this info? Rough estimates usually adequate?
Where do these numbers go into Quartus?Link Copied
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Unless you have a very timing-critical design, I believe this is one of the MANY Quartus II compilation warning messages that you can ignore. At least until you get down to the final optimization of the design.
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I got the same warning, because the default cap load is 0pF for the pin output type you have specified. If you go to the Assignments/Device... tab and click on the "Device and Pin Options..." button, you will find "Capacitive Loading" under Category:. Here you can set the default load cap for the output driver type in your design.
I find this useful for output timing analysis. It will also help you choose the minimum output drive strength to meet your desired output timing.
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