tocol ▁( HTTP ) ▁request ▁submitted ▁when ▁downloading ▁a ▁web ▁page . ▁These ▁requests ▁total ▁the ▁number ▁of ▁page ▁elements ▁required ▁for ▁download . ▁However , ▁a ▁browser ▁is ▁limited ▁to ▁opening ▁only ▁a ▁certain ▁number ▁of ▁simultane ous ▁connections ▁to ▁a ▁single ▁host . ▁To ▁prevent ▁bott l ene cks , ▁the ▁number ▁of ▁individual ▁page ▁elements ▁are ▁reduced ▁using ▁resource ▁cons olid ation ▁where by ▁smaller ▁files ▁( such ▁as ▁images ) ▁are ▁bund led ▁together ▁into ▁one ▁file . ▁This ▁reduces ▁HTTP ▁requests ▁and ▁the ▁number ▁of ▁" round ▁tri ps " ▁required ▁to ▁load ▁a ▁web ▁page . ▁ ▁Web ▁pages ▁are ▁constructed ▁from ▁code ▁files ▁such ▁JavaScript ▁and ▁Hyper text ▁Mark up ▁Language ▁( HTML ). ▁As ▁web ▁pages ▁grow ▁in ▁complexity , ▁so ▁do ▁their ▁code ▁files ▁and ▁subsequently ▁their ▁load ▁times . ▁File ▁compression ▁can ▁reduce ▁code ▁files ▁by ▁as ▁much ▁as ▁ 8 0 %, ▁thereby ▁impro ving ▁site ▁respons iveness . ▁▁ ▁Web ▁C aching ▁Opt im ization ▁reduces ▁server ▁load , ▁band width ▁usage ▁and ▁laten cy . ▁CD N s ▁use ▁dedicated ▁web ▁caching ▁software ▁to ▁store ▁copies ▁of ▁documents ▁passing ▁through ▁their ▁system . ▁Sub sequ ent ▁requests ▁from ▁the ▁cache ▁may ▁be ▁ful filled ▁should ▁certain ▁conditions ▁apply . ▁Web ▁c aches ▁are ▁located ▁on ▁either ▁the ▁client ▁side ▁( forward ▁position ) ▁or ▁web - server ▁side ▁( reverse ▁position ) ▁of ▁a ▁CD N . ▁To o , ▁a ▁web ▁browser ▁may ▁also ▁store ▁web ▁content ▁for ▁reuse