It depends
Hello,
Those jumpers might indeed by decorative, but before performing a jumperectomy, get a detailed analysis of loads and geometry. In addition to keeping the main from pulling the top of the mast aft, the jumpers also keep it from going to leeward, the proportion of effort being related to the angles that the jumpers form to the mast. Depending on how much of the mast extends beyond other supports, those jumpers could be vital. Note also that the lower ends of the jumper stays interact with the diamonds and forward struts, especially the lower ones. If you do decide to remove the jumpers, watch out for effects lower down. Got any pictures?
Fair leads,
Brion Toss
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