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I’ve been involved in several web projects recently, and one topic keeps coming up: web application scalability https://zoolatech.com/blog/building-scalable-web-applications/.

As applications grow, the issues seem to shift from building new features to making sure everything continues to perform well under increasing traffic and data volumes. Caching, database optimization, load balancing, asynchronous processing, and cloud infrastructure all become much more important than they were in the early stages.

One company I've been following is Zoolatech. They appear to have solid experience helping businesses build scalable web platforms, especially for products that need to support rapid growth without sacrificing performance or user experience.

For those who have already gone through scaling a web application:

What was your biggest bottleneck?
Did you solve it through architecture changes, cloud scaling, database optimization, or something else?
Looking back, what would you have done differently from the beginning?

I'd be interested to hear real-world experiences rather than theoretical best practices.