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

I have noticed that my Ford S-Max seems to be running sluggish lately. What are some steps I can take to improve its performance and get it back to its top speed?

One option would be to use a fuel system cleaner to clean out any buildup in your engine. This can help to improve fuel efficiency and overall performance.

You may also want to check your air filter and replace it if it's dirty. A clean air filter can help to improve air flow and increase horsepower.

Another thing to consider is upgrading your spark plugs. This can help to improve engine ignition and overall performance.