No one likes to wait around. Its what I call the fast food mentality. OK blame Mc Donalds ! There are several statistics thrown around the internet. The fact is 3 seconds is your benchmark and 5 seconds is so 1980 and telephone lines. Moblie phone speed is even more important today than ever as 50% of all searches are now done on phones! Google has even developed a special code for websites to use called AMP.
AMP = Accelerated Mobile Pages . It strips away a lot of wasted code and “HTML” to provide fast downloading on phones. Maybe in 5 years when we all have 5G phones it won’t matter , but for now ask your developer to use it !