Performance Optimization Assistance Needed

I’m looking to boost the way my existing project actually works. The look and feel are fine for now; what I need is sharper performance, cleaner operation, and the removal of any bottlenecks or quirks that slow users down... (Budget: ₹600 - ₹1500 INR, Jobs: Agile Development, Application Performance Monitoring, Continuous Integration, Debugging, DevOps, Software Development, Software Engineering, Software Testing, Video Editing)