I had implemented the serial commands but deleted them coz I thought that it is too much load on the processor plz help man thanks
OK. Because is not spelled coz. Please is not spelled plz.
You thought wrong. The processor runs full out all the time, doing something useful or doing nothing. Serial output will slow the processor down, because it has something to do. But, your program is hardly challenging the processor. So, put them back until you figure out why the program takes so long to react to a change.
Doing that for 4 switches at once is silly. Dump three of them.