What is the best way to improve the performance of a Ford S-Max engine?

I recently purchased a Ford S-Max and have noticed that the engine doesn't seem to be running as smooth as it used to. Is there anything I can do to improve its performance?

One of the most effective ways to improve the performance of a Ford S-Max engine is to regularly change the air filter. This will ensure that the engine is getting a clean and efficient air supply, which is essential for optimal performance.

You can also consider upgrading to a high-performance air filter or aftermarket air intake system. These can increase air flow and improve the engine's power output.

Regularly checking and replacing spark plugs and ignition coils can also have a positive impact on the engine's performance.