For the record, there are 2 patches:
- the first one was not risky at all so we also included it into the next 5.2: it reduces the memory used by the LoadPlan based entity loaders (you have 13 of them with a batch size of 50) by sharing what could be shared: it reduces the memory used from 1 GB to ~470 MB in your case
- the second one was only applied to 5.3 and lazy load the per lock mode loaders (it loads eagerly the two most commonly used and loads lazily the others). This accounts for the rest of the gain but obviously if you are using some exotic lock modes, more memory will be used once they get used in your application. It should help anyway as there is very little chance that you use the 11 lock modes involved for all your entities.