Aleksei worked on enhancing model element loading and rendering in the oven-sh/WebKit and WebKit/WebKit repositories, focusing on performance and stability for model-heavy web pages. He implemented lazy loading for HTMLModelElement using C++ and JavaScript, introducing viewport-based logic to load models only when visible, which reduced memory usage and improved resource management. Aleksei also addressed bugs affecting model loading stability and entity transform restoration, ensuring consistent rendering and synchronization between ModelProcess and Web Content Process during reloads. His work demonstrated depth in regression testing, performance optimization, and cross-process coordination, resulting in more efficient and reliable model handling in WebKit.