There is a lot of shared memory between renderers and the browser. Your 208MB might not be additional, but a big subset of it could be shared with the renderer

There is a lot of shared memory between renderers and the browser. Your 208MB might not be additional, but a big subset of it could be shared with the renderer/gpu process. If you want to know where the memory is going you can go to about://tracing and enable the memory-infra category.