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If I compile Sage from source, will it start up faster?

Basically the thing that annoys me about sage is the slow start-up time. It takes about 13 seconds to get to the prompt. Now, I had compiled sage before, but I mistakenly did that with the -march=generic flag. Now, if I compile it with the -march=native (znver1 in my case) and -03 flags, will it start up faster? Has anybody else compiled it with -03? Any other flags I should be aware of?