Hi,
Yes. You can edit the HikaShop User Synchronization plugin settings via the Joomla plugins manager and turn off the "Load HikaShop on all pages" setting.
Note however that it shouldn't change much regarding loading time. The problem is probably elsewhere.
Also, this has the drawback that the HikaShop content tags won't work properly on non HikaShop pages:
www.hikashop.com/support/documentation/1...-product-insert.html
(normal since content tags can't be replaced by HikaShop if HikaShop is not loaded)
Note also that even if the page is not a "HikaShop page", as long as you have the cart module or a products listing module or the currency switch module displayed on the page, HikaShop will be loaded since it is necessary to display these.