If you don't have it, then it doesn't exist.
I upgraded to Yosemite when it was less than a week old. Experienced pointer lag using the Magic Mouse and Wifi speeds would go down to a crawl when BT was in use.
- Changed Wifi channels, didn't help;
- Contacted Apple about it, they asked me to install Yosemite again without formatting my SSD. Did that, didn't help;
- Several reports over the internet started appearing. People experiencing pointer lag using all different kinds of routers (including Apple's);
- Contacted support again. This time they asked me to format my SSD and use Yosemite with nothing installed. Did that, still experienced pointer lag;
- 10.10.1 came out. Did not fix it;
- Finally decided to get back to Mavericks (apart from the annoying pointer lag, the UI behaved terribly on my 2012 rMBP) and TADAAAA, same environment, same router, same settings, same everything. Issue gone.
I hope these tests are enough for you to understand that this issue does exist, it affects a considerable amount of people and it sucks that Apple could not fix it after 5 months and 3 point updates.