Is there a way to get VPN performance from India to USA to be consistent with the performance from USA to USA or will network performance from India to USA always be behind no matter what steps are taken?
Always be behind. See, VPN uses the internet. The internet uses electicity and optical signals. Per definition there is this funny thing called speed of light.
Basically, US to US is a lot less distance, so signals travel in a lot less time. Simple like that.
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In reality India seems to have quite poor external and internal internet connectivity - hops and connection speed and the reliability of each hop/network is the issue IMO much more than the simple fact of distance.