There are a few reasons why your Playstation 5 may be lagging behind your Playstation 4. One reason could be that the Playstation 5 has a much more powerful graphics chip than the Playstation 4. This means that it can handle more complex graphics and animations much better than the Playstation 4. Additionally, your Playstation 5 may have a different processor, which could cause it to lag behind. Finally, if you have an older game or application on your Playstation 4 that is no longer supported by the company, then your Playstation 5 may not be able to run it as well as newer games or applications.