Improving performance

I have started looking at some code written by a precious developer here at work that is crashing every time it gets called.

I won’t got into details, but it’s a bit monolithic, it’s a WCF call that encases a foreach loop and makes decisions on stock level and availability. If a product in the master list (5000+ objects) isn’t in the short list it zeros everything, other wise it uses a ternary operator to set stock levels.

Has anyone got any go to performance improvement books or sites that might help me with the issue?

submitted by /u/JEv5
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