Do not configure the Service Links module with TinyURL.com
We recently conducted a performance assessment for a client, and the main problem was something really simple, but also very detrimental to the site.
The site used the Service Links module, version 6.x-2.x.
The following are the performance figures for the site, in seconds, before any tuning.
3.67 http://example.com/product/215 2.64 http://example.com/product/572 68.32 http://example.com/list1 65.11 http://example.com/list2