Thanks for your suggestions. I changed my bios setting as you recommended. My computer did speed up quite a bit! This time I tracked its performance using CineBench and the scores went up after I changed the bios setting.
The same odd thing happened when I ran my codes, though: the estimated time (calculated by ProgressMeter) initially went down and then gradually increased. Before I added the memory sticks, the estimated time never went up. I cannot figure out if this was because of my codes (I did not change my codes during this process) or because of my computer.
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