I have observed the issue shared by you and like to share that when presentation gets loaded in DOM (Document Object Model) of Aspose.Slides, all statics are initialized along with all presentation data structure. The amount of memory consumed is directly proportional to number of slides, shapes inside slides (especially multimedia content) and size of presentation. Moreover, additional memory is required if you perform rendering of presentation to PDF, image or any thing else. I hope the shared elaboration will be helpful. If there is still an issue then please share the source presentation, Operating System details, Java details, Machine information and statistics achieved. We will investigate the issue further on our end to help you.