Hello, I really like PP, however my biggest issue is that it uses Time-weighted rate of return on the chart rather than Money-weighted rate of return. MWRR is the real portfolio return so I would say it would be better to use this return rather than TWRR. At the end of the day we care more about how much money we actually make (which MWRR shows) rather than some theoretical return percentage (TWRR). And market timing is very important aspect of investments as well. Or maybe we could have an option to chart both types of returns.
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I like the idea… 
@AndreasB @Ragas
Do you think its possible to implement this feature?!
(Diagram, Widget, …)
Not trivial. German-language thread: