I imported your background guitars image and it is PNG and 3MB which is why there is a delay before the image reveals.
I exported the image from Xara as a JPEG 100%, probably 90 or 95 would be just as good, and the file size at 100% is 1.63 MB. At 85% this drops to 1/2MB and the quality is about the same. You might replace the PNG with a JPEG version. The whole page will load faster as well.
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