Correct ... You're best option is to reduce the animation speed to .5x as this will "speed up" the transitions and window/apo drawer pop-ups and give the "impression" of faster speed.
There's most likely (as posted in other avenues) a memory leak which implies a reboot now and then may also help with performance.
You can change animation speed via the developer options as well, there are three settings, just change all to .5x and then open folders and the app drawer and you should immediately see a noticeable improvement in transition which often tends to make people believe there is a lag.
As per app lag, a reboot now and then will help, just a fact of life with java, as they say, "you used to have a problem, now you have a ProblemFactory"
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