Is it necessary to increase the number of milliseconds and save several KB of memory in the program?

I remember a text when I was in primary school , It is said that there is a person who is very frugal , Not only does he save at home , If other people eat leftovers , He would pack it up, dry it and store it . Then there happened to be a year of famine , Everyone has no rice , He gave everyone the rice he had saved in those years .

I think saving depends on the situation , At that time, grain production was low , If you don't save , Then you may not have enough to eat .

But now it's different , Now? MCU You can add memory whenever you move , We just started using mobile phones , Memory 256M, Now the memory is directly 8G. The previous picture is 640*480, Now a picture is directly dozens M Size .

If you save code space by doing this , Not much use .

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What I want to say is , The space occupied by the code is much less than that occupied by the actual storage , If it can be optimized, it must be good , I have also been in 52832 The project on is migrated to 51822 Experience of optimization , It also takes effort to save dozens of bytes , especially , Many people write the flag bit generally int flag, We used a bit To make a sign .

Because the running speed will directly affect the performance of the product , Therefore, the speed of operation will directly let users feel the quality of the product , like , If we open a video, we need to wait a few minutes , Then you may not have the desire to watch videos . If it takes several hours to turn on , You may also have no desire to use computers and mobile phones .

But there is a saying , Nowadays, Android phones are very slow to start , The reason why we can't feel this pain , It's because switching on and off mobile phones has become a very low-frequency thing .

But you said in 1 Hours of startup time / Reduce 1ms, There is no feeling from the user's feeling . But say , If you add 1ms, It's hard for users .