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One of the biggest mistakes I made is not exploring spot instances and reserved instances earlier.

I cut my bill by 70-80%% after paying full price for years...

If you have an active web server or backend workers with fairly short jobs, spot instances will work for you.

Does the 'cpu credits' stuff apply to spot instances too? I have been thinking of shortening my animation render time with spot instances, but it only makes sense if I can run every core at 100% for the entire life of the instance.

I believe so, if it's a T series. For 100% CPU usage, it's cheaper to just get a non T series instance like a M.

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