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The top surface of the trackpad is a thin layer of glass, and it could be that there is a thin layer of oil on it. I would recommend cleaning it with a lint free cloth and some screen cleaner, or a screen cleaning cloth for cleaning LCD screens that you can get from a computer supply store.
If this does not resolve the issue then it could be a software issue.
Reset the PRAM. Shut down the MacBook.
Start and immediately hold Command-Alt-P-R keys together.
Keep holding those 4 keys until you hear a second startup chime and release them.
Now test the trackpad responsiveness.
If the issue is the same please get back to me. Let me know if it is the same in all applications by testing it with a few different applications.
Thanks in advance.
Hi, have those steps worked? If not please get back to me, we will look at the issue in more detail. Thanks!