Lately just browsing ebay is causing my PC fans to spin loudly and even slow the browser down especially if I have more than one window open. Anyone else experiencing this?
Any difference if you temporarily disable your ad blocker?
If that speeds things up when searching, try disabling just the Anti-Circumvention filter in Ad Block, or the ABP filters in Ad Block Plus, or the equivalent filters in other ad blockers.
Those filters have been associated with search results loading slowly and heavy resource usage in the past.