I read this recently about plateau- ing. It's the way we practice that we feel we make improvements. Making goals and reviewing them before the start of the practice. Thanks for mentioning it!
Plateauing is something that is very age dependant (hits later in some, hits earlier in older players). I never hit a plateau until after 5-6 years of playing and getting in to competition performance levels.
Of course, like anything else, there are different kinds/levels of plateaus but basically they are all the same.
It's when you suddenly no longer advance or cannot get past a tough section in a song. Really, there are only 2 things to do to get past it:
1. Slow down or stop for a while until you are mentally rested and ready to push past it slowly
2. Power through it, push hard, don't stop until you push past the plateau or block
Either way works and which method you use depends on you.
The first version is better for older, non-professionals/performers or low-mid level players. It is easier mentally and takes longer because there is no need for the high stresses requested to power through. You get through it slowly, no stress, over a longer period of time.
Though anyone can do either method, the second way is more for advanced players where there are set goals to reach and there may be time constraints. It pushes you over the plateau faster, but the stresses are much higher. Grim determination, motivation, a set game plan and firmly set micro-goals are placed in front of the performer, tackled and moved on to the next set of goals. In extreme cases, one is placed in to very long hours over many consecutive days, weeks or months.
Pushed to the limits, one has the distinct possibility of burning out a player and in extreme circumstances, can cause a player to stop all together. This is what happened to me.
I've done both, I prefer the slower/longer/gentler method now, but I did the second method for years.
When young, I powered through plateaus to push to higher plateaus and so on. It's brutal, but there is no better way to move forward and improve at very fast rates. It involves a massive time investment, high motivation, and quite honestly, most can do it for short periods of time, but the ones that push in to the 10-12 hours a day, 6-7 days a week, growth is amazing, its the equivalent of being an athlete on steroids... but the downsides are equally as harsh.
Choose the method that works for your needs, but I would now advocate moderation when powering through. Know when enough is enough, you'll stay in the game longer.