The full answer
Slow software usually has a few dominant causes rather than many small ones: unindexed database queries, APIs that fetch far more data than a screen needs, large JavaScript bundles, unoptimised images, chatty mobile network calls or servers that cannot scale under load. Guessing is expensive, so the engagement starts with measurement.
Creuto profiles the application in a staging environment with realistic data, runs load tests and reviews Core Web Vitals for web products. The output is a prioritised list of fixes with the expected gain for each, so you can decide how far to go in the first phase.
Typical fixes include query and index tuning, caching with Redis, pagination and payload trimming in APIs, code splitting and server-side rendering in React and Next.js front ends, image and asset optimisation, and infrastructure changes such as autoscaling, CDNs or moving to Kubernetes or serverless where it helps.
The work ends with monitoring and alerting in place, so the team sees response times, error rates and resource use in production. Performance engineering is often a short fixed-scope engagement and can lead into a longer modernisation if the architecture itself is the limit. Share your current pain points on a discovery call.