Systems and methods for monitoring the performance of client-server transactions from the perspective of a client. In one embodiment, a JARTA (Java Application Response Time Analyzer) component (which may include JavaScript) is installed on an end user's browser to collect various response time measurements and certain client system information and transmit this information to a server. A JARTA utility on the web server can manage the actions (e.g., insert, modify, and delete) associated with web pages that are ear-marked for JARTA testing at the client browser. The JARTA component may include a Java.TM. applet that can be downloaded to a client computer along with a web page. In one embodiment, a certain percentage of web transactions to be monitored can be designated using, e.g., a sampling algorithm.