Need to test the load on the site, who can advise?

Started a new project, and the site began to slow down sharply when traffic increases. I realized that I can't do without normal testing - I want to understand where the bottlenecks are. Who has encountered this and what performance testing services can be tried?

Many people are familiar with this issue - everything seems to work, while there are few users. But as soon as the traffic starts, things start to slow down. In a similar situation, we turned to guys who deal with performance testing services - you can see here: https://pharosproduction.com/performance-testing-services They helped us find specific problems and optimize them.

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