In addition to the above posts, the next support package (SP3) for SAP Screen Personas 2.0 is expected to bring significant performance improvements with the so-called "slim state". This will reduce the data being transferred between the Personas client and the backend. The result will be better response time, especially if the screen has large tables which are usually causing performance problems.
It is important to mention that "slim state" will require the most recent kernel patch to work so if you are planning to take advantage of it, you must prepare for the kernel patch as well.