Before checking anywhere else, it is advisable to validate the scripts and tools being used for performance testing.<\/p>\n
\u00bb\u00a0Does high response time include think time unknowingly?<\/p>\n
\u00bb\u00a0Is there redundant logic (e.g. client side functionality) inside transaction for which response time is reported?<\/p>\n
\u00bb\u00a0Which tool is being used for load generation? What is the logic for calculating response time?<\/p>\n
\u00bb\u00a0Is there any extended logging being used? Extended logging will skew the response time.<\/p>\n
\u00bb\u00a0Has browser (number of parallel connections) been emulated realistically?<\/p>\n
<\/p>\n
Step 2:<\/strong> Issue with Infrastructure where load generators are installed<\/p>\n It is important to monitor hardware performance where load generators are installed. The response time information might be incorrectly stated when low configuration machines are used.<\/p>\n \u00bb\u00a0Are hardware utilization (CPU, Memory, I\/O) overly stressed?<\/p>\n \u00bb\u00a0Are there issues (Latency, Packet Loss and Bandwidth) with network?<\/p>\n <\/p>\n Step 3:<\/strong> Issue with client side logic and web page resources<\/p>\n Response time can be improved by optimizing the client side logic first before tweaking the server side logic<\/p>\n \u00bb\u00a0Are images being scaled unnecessarily? Avoid scaling of images in HTML reduces the bandwidth usage and round trip time<\/p>\n \u00bb\u00a0Is CDN being used for serving the static resources? CDN helps in serving the static resources faster<\/p>\n \u00bb\u00a0Is JS \/ CSS blocking loading of other resources? Loading of JS \/ CSS can be deferred to unblock other resources<\/p>\n \u00bb\u00a0Is unused code also being downloaded? Apart from performance, it risks security as well<\/p>\n \u00bb\u00a0Are there many third party ads being loaded? Is third party ad causing slow response time?<\/p>\n \u00bb\u00a0Is caching being used properly? Caching helps in serving the requests faster.<\/p>\n \u00bb\u00a0Is cookie less domain being used for static resources? It helps in optimizing the bandwidth.<\/p>\n \u00bb\u00a0Are images being loaded in parallel? How many parallel threads being used?<\/p>\n \u00bb\u00a0Are images optimized for better serving and bandwidth?<\/p>\n \u00bb\u00a0Is CSS sprite being used for loading logos?<\/p>\n \u00bb\u00a0Are resources being compressed before serving?<\/p>\n \u00bb\u00a0Has redundant code and space being removed before serving JS \/ CSS files?<\/p>\n \u00bb\u00a0Are view states being used properly?<\/p>\n \u00bb\u00a0Is this possible to reduce number of requests by validating content on client side rather than on server side?<\/p>\n <\/p>\n Step 4:<\/strong> Issue with load balancer<\/p>\n \u00bb\u00a0Is load balancer algorithm working as expected? Are all requests being distributed evenly on active servers?<\/p>\n <\/p>\n Step 5:<\/strong> Issue with Web Server<\/p>\n \u00bb\u00a0Does it require improving hardware (CPU, Memory, I\/O) of web server?<\/p>\n \u00bb\u00a0Is caching being utilized properly on web server?<\/p>\n \u00bb\u00a0How threads are being utilized? Are there enough threads allocated in thread pool?<\/p>\n \u00bb\u00a0Are there requests waiting for external resources (database, disk, payment gateway etc.)?<\/p>\n \u00bb\u00a0Is web server configured as per required load? Configuration related to thread pool, number of concurrent users allowed etc.?<\/p>\n <\/p>\n Step 6:<\/strong> Issue with Application Server<\/p>\n \u00bb\u00a0Does it require improving hardware (CPU, Memory, I\/O) of application server?<\/p>\n \u00bb\u00a0Is JVM configured properly for heap size, thread models, GC scheme and JVM version?<\/p>\n \u00bb\u00a0Is garbage collector working efficiently? Can it be optimized further by sizing the generation and selecting a proper collector?<\/p>\n \u00bb\u00a0Is caching being utilized properly on application server? Connection cache? File cache?<\/p>\n \u00bb\u00a0Is thread pool configured properly? Maximum threads? Queue length?<\/p>\n \u00bb\u00a0Are sessions being configured properly like session time out?<\/p>\n \u00bb\u00a0Are many exceptions stack trace found in debug log file?<\/p>\n \u00bb\u00a0Are asynchronous calls being handled optimistically?<\/p>\n <\/p>\n Step 7:<\/strong> Issue with Database Server<\/p>\n \u00bb\u00a0Does it require improving hardware (CPU, Memory, I\/O) of database server?<\/p>\n \u00bb\u00a0Are indexes being used properly?<\/p>\n \u00bb\u00a0Are there expensive queries that can be tweaked \/ improved?<\/p>\n \u00bb\u00a0Are there blocking issues due to locks?<\/p>\n \u00bb\u00a0Are indexes heavily fragmented? Is database in need of defragmentation?<\/p>\n \u00bb\u00a0Is it a replication intensive environment? Is replication is causing slowness?<\/p>\n \u00bb\u00a0Has database statistics been updated? When was the last time database statistics run?<\/p>\n
![\"performance](\"https:\/\/www.cigniti.com\/blog\/wp-content\/uploads\/2015\/11\/Banner_08.jpg\")
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