Well for one it uses EIGHT entry guards instead of three. Tor devs are currently in the process of changed the default to TWO because even three is too many. Every entry guard you use is another possibility of having a compromised entry guard, and having a compromised entry guard is 50% of a timing attack. Plus you will stick out as someone using eight entry guards, which pretty much nobody does. If there were safe ways for Tor to go faster the Tor devs would implement them.