Doubling pointer size from 32 to 64 bits doesn't double your performance — it can silently bloat your memory footprint by 30 to 50 percent before you've changed a single line of logic. That's the trap OpenClaw's developers had to navigate. A 16-bit address space tops out at 64 kilobytes. The 32-bit expansion blew that ceiling to 4 gigabytes — a seismic shift that let engines like Monolith's actually hold a full game world in RAM. But 64-bit is not just "more of the same." While pool allocators are efficient for high-frequency objects, the focus here is on the structural challenges of transitioning to 64-bit architecture. Now the question is what happens at the structural layer, when the engine's pointer model itself is wrong for the hardware it's running on. Transitioning from 32-bit to 64-bit addressing in the Captain Claw engine involves doubling pointer sizes, impacting memory usage and performance. That sounds minor, Sergey, but consider a level with thousands of live object references — enemy structs, tile pointers, collision handles. Each pointer doubling in size means every array of pointers, every linked list node, every cached object reference now consumes twice the memory for the pointer itself. Cache lines fill faster with metadata instead of actual game data. The CPU prefetcher, which loved the tight pool layouts we discussed, now has to work harder just to load the same number of object references. More cache misses. More stalls. Bigger address space, worse cache behavior — that's the counterintuitive reality. Pointer swizzling addresses the challenge of converting 32-bit serialized data to 64-bit runtime addresses, ensuring data integrity. Loading that data on a 64-bit runtime means those addresses are garbage. Swizzling replaces stored 32-bit offsets with valid 64-bit runtime addresses at load time, translating the old memory map into the new one without corrupting the logic that depends on it. It's a one-time translation pass, not a runtime overhead. Alignment issues arise as 64-bit values require 8-byte alignment, leading to potential misalignment faults or inefficient memory access. The original 32-bit structs were packed for 4-byte alignment. Recompiling for 64-bit can insert padding bytes automatically, changing struct sizes and breaking any code that assumed a fixed layout. The key takeaway is that a larger address space requires careful management to avoid performance pitfalls. Transitioning a 1990s engine to 64-bit systems requires auditing every pointer, every struct layout, and every serialized address — because the hardware's new capabilities will silently punish assumptions the original authors never knew they were making. More addressable RAM is a ceiling, not a floor. What you do inside that ceiling, with alignment, swizzling, and pointer discipline, is what actually determines whether the engine runs better or just runs bigger.