If you don’t prepare your software for a high load and fail to lay a high-load architecture in time, several challenges can co-occur:
slow response times;
unresponsive and flawed UX;
unpredictable crashes and disconnects;
database outages, etc.
All the above issues can increase customer churn and result in lost revenue opportunities. If you have rigid performance requirements, think about creating an application based on a scalable high-load architecture as early as possible.