Using classes can significantly decrease performance and increase complexity in software development. Every new instance of a class can result in cache misses, degrading speed. A complex structure with multiple methods and fields increases the likelihood of state corruption, making it challenging to track possible object states. Refactoring a typical customer-class structure with arrays can result in a substantial performance improvement, demonstrating the drawbacks of traditional object-oriented approaches regarding memory access patterns and code complexity.
Every class is a petri dish for state corruption. You have ten methods touching five fields. Quick: tell me all the possible states your object can be in. You can't. Nobody can.
Write a Customer class with a List<Order> where each Order had a List<LineItem>. Following one customer's data meant chasing pointers all over the heap.
Replace it with three arrays - customers, orders, line items - and suddenly the same algorithm runs 50x faster. Not 50%. Fifty times.
Every new MyClass() is another cache miss waiting to happen. Your CPU has these beautiful cache lines, 64 bytes of data it can grab at once.
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