else ladders practice

somethins i got such pices of code like
if(n==1) {/*something/}
if(n==2) {/*something/}
if(n==3) {/*something/}
if(n==4) {/*something/}
if(n==5) {/*something/}
technically i would need to add elses - but the question is if to do that
do teh code has really chance to be slower without else (except some very prmitive compilers) ??
not adding else makes liek code shorter.. so im not literally sure which is better