Any method of making sure you are playing in time is beneficial.  These include playing with a metronome, or along with a recording, or a backing track, or even other musicians.  

But it's important to realize that there are often multiple steps involved in this process of increasing your skill.  At first you have to focus on the physical motions, making sure they are executed cleanly and correctly.  Then you gradually start to increase your speed at those motions.

I've seen many students get frustrated by their inability to play something (lick, riff, whole song) perfectly in time & up to speed when they just figured it out or just started learning it.  We've all been there!

Repetitious practice & patience is of course the general solution.  But it can help to get clear on exactly what you're having trouble with.  

If there is some specific technique or aspect of your playing you are struggling with, please ask!