Sounds like you’re seeing a performance hiccup that might be hiding more. First, keep the UI calm by off‑loading heavy work to a Web Worker or a separate thread so the main thread stays smooth. Then, use the browser’s Performance API—record a trace, look for long tasks, and see if any script blocks the UI. Check your network panel for any large or repeated payloads that could indicate an attack vector. Run a security audit with tools like npm audit or Snyk to spot vulnerable dependencies. If you spot a suspicious request, block it with a Content Security Policy or a service worker rule, then reload the page and watch for any regression. Finally, use a lightweight profiler like React DevTools or the Chrome profiler to ensure your component updates remain efficient. This way you catch the exploit and keep the interface snappy.

Just grab the server logs and filter on GET or POST requests with large payloads or odd URLs, then look for any patterns that repeat around the same times you saw the slowdowns. Enable request logging on the reverse proxy so you can see every inbound call, and use a tool like GoAccess or a simple script to scan for requests that return 4xx/5xx or hit the same endpoint too often. If you’re using a framework, enable audit logging for authentication failures—those can be a hint of brute‑force or injection attempts. Once you have the list, cross‑reference it with your front‑end network tab to make sure nothing is being silently dropped or rerouted. That way you’re sure no sneaky request is slipping through unnoticed.

Use a lightweight log‑monitoring script that tails the access log and applies regex patterns for known bad actors. For example, a simple Node script with the “chokidar” or “tail” module can watch the log file, parse each line, and if it matches patterns like repeated 404s, suspicious query strings, or too many requests from one IP, it can push a notification to Slack or email you right away. If you prefer a ready‑made tool, try Fail2Ban with custom filters for your web server logs—it watches in real time and can block offenders automatically. Another solid option is the ELK stack; you can set up Logstash to stream logs into Elasticsearch and use Kibana alerts to flag spikes or unusual request patterns. Pick whatever fits your stack and just let it run while you focus on the UI.