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How much of your traffic is referral vs direct? that will start to help you with the answer...

For a long time I had a referral from india, when they stopped linking to my trafic from the country dropped by 50%...

Google analytics is your friend...

Another area to help with the images is to host them on a content distribution network.

Amazon is not the cheapest, but its the easiest for low volume.

A few stats:

I host about 4000 images on Amazon S3.

My bill is about 4 bucks a month.

You can put your images in a few areas (west coast vs east coast etc)....

This will help get your images closer to your audience, but it will not help you with the "last mile"

I had a customer uploading 7 MB images in Wisconsin using dial up....

can't help them...

I'm alos moving to Cloud Front, amazon Content Distribution Network...

Also, you use chrome to determine what's causing the delay.. many times, images are just part of a larger problem...

How much of your traffic is referral vs direct? that will start to help you with the answer...

For a long time I had a referral from india, when they stopped linking to my trafic from the country dropped by 50%...

Google analytics is your friend...