Go memory usage - analyze odd behaviour

It was noticed in #772 (comment 994114127) , that there is huge RSS memory utilization of Pages, which is close to 5GB currently though only around 2GB is showing up on the heap which is also seen in pprof.

We want to analyze why this happens and how can we(if we can) solve this.

Although, this looks like an issue that would affect all the Go projects, since it has manifested in Pages, we should analyze it and then apply the learnings to other projects as well.