You can see exactly what is taking up the memory by looking at the heap in devconsole
“The Luau heap tool allows you to create snapshots on the current allocation of heap memory, which refers to the memory allocation to Luau scripts for storing variables, tables, functions, and other runtime data structures. This tool provides various memory allocation views to help you identify memory allocation and issues from different perspectives, such as object types and engine classes. It also allows you to create multiple snapshots to compare differences in memory usage over time.” - Memory usage | Documentation - Roblox Creator Hub