Improved the main performance article to make it more actionable#7960

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javiereguiluz wants to merge 4 commits intosymfony:2.7from

javiereguiluz:improve_performance

Commits on May 29, 2017

Improved the main performance article to make it more actionable
javiereguiluz
committed

Commits on May 31, 2017

Use another format for the checklist
javiereguiluz
committed

Commits on Jun 18, 2017