Everton boss Roberto Martinez was left frustrated with their 2-2 draw with Arsenal.
Arsenal looked to be heading for defeat after Seamus Coleman and Steven Naismith put Everton 2-0 up before half-time.
Olivier Giroud came off the bench and went on to score a last-minute winner, following a strike by Aaron Ramsey.
Martinez could not hide his dismay at the way sloppy marking allowed Ramsey to turn home Santi Cazorla's cross, then poor defending permitted Giroud to head in Nacho Monreal's ball into the box.
"For 70-75 minutes it was the perfect performance, very similar to the one we had last time against Arsenal," Martinez said.
"The first half was full of dynamic football. Scoring two goals should be enough to control the game in a manner we normally do.
"Certain individuals, and as a team, dropped our level. The disappointment is the result but the performance was phenomenal."
Martinez was worried to see his team tire in the dying minutes.
"There was a drop in our energy levels," the former Wigan boss said.
"We are not a defensive side. We want to get on the ball but to do that you have to have the energy to do that.
"The energy levels at the moment are vital for us to perform for 90 minutes."
