Perform against who? they beat Nottingham Forrest because they were lucky and other matches they ended in draw against big teams also due to luck. But, Chelsea performance currently quite bad, Palmer no longer give a big contribution. I don't expect Chelsea will beat Everton easily because Everton have a good defense, I predict it will end in draw.
The odds for Chelsea to win is too low, it's @1.44, it's really people are sure Chelsea gonna win the match. While draw, the odds is @4.40, worth to bet for me.
We can all have a mix of thought about Everton's performance around this time of the season but on a neutral analysis of the results of their recent games it's not enough to say Everton have performed so well anyway. They have had series of draws with almost all the sides they have played with even in matches they should have won they ended drawing. Their win against Nottingham forest was just a narrow 0-1 win in a game Forest had a better performance but were just unlucky.

Right about now it's 90+2 minutes into the Chelsea Vs Everton game and Chelsea are leading with a lone goal to nothing. A win for a 3 points that will put Chelsea 4th on standings with just 1 point behind Manchester city.
Everton I know has always had the attribute of inconsistency in the English Premier league. The only time they become serious and start beating big teams is when they want to escape relegation. But as at today, they are not fighting to escape relegation whereas Chelsea wants to go champions league. This is the reason why I know Chelsea is going to win Everton even if Chelsea is also not very consistent this season.
Congratulations to Chelsea for a beautiful win.