问题
Windows 10, Delphi 10.2 Tokyo, Firemonkey framework.
I drop a TCombobox on the form, populate it with 20000 items (takes 5 seconds), then when I click the arrow of the combobox for the dropdown to appear, it takes 15 seconds to do so. The VCL TComboBox does this instantly for me.
Is there anything I can do to speed up this behavior? Why does it take that long?
来源：https://stackoverflow.com/questions/43232968/delphi-firemonkey-tcombobox-extreme-slow-opening