If you end up getting a small team and push them relentlessly to make everything work, even with extra hours you will not get what you need, when you are this big then you will need a whole team of people who could do this. Stake obviously does not have enough developers, no matter how great the developers they have right now, if their number is not enough, they won't be able to reach to every single issue.
These problems aren't anything new. I have gotten used to their laggy UI interface over time and I doubt they will resolve these issues anytime soon despite having enough money to mitigate them in a short period of time.
They definitely need to improve the quality of their development team, but I am pretty sure that it won't happen anytime soon. Embarassing!