Hi Lore,
Everything’s possible 
In photoshop, what you are referring to is called the step of a brush. Basically that’s a value that control the spacing between two strokes of a brush.
If you are going too fast so it leaves space in between each strokes, you just need to assume the brush went straight between those two positions and add some “fake” strokes every step value. If step value is small enough, it should solve your issue.