San Francisco-based ThousandEyes raised $20 million in a new funding round, the company said in a regulatory filing. The startup makes software that monitors cloud-based applications, looking for issues such as lags.

ThousandEyes customers are both SaaS and enterprise companies. SaaS providers log into ThousandEyes and test from different locations to determine how the app is behaving across public infrastructure. The enterprise uses ThousandEyes private agents to see what is happening internally with visibility all the way to the cloud provider.

ThousandEyes focuses on the way network performance affects the way apps run. It can help admins figure out which specific segments of a network might responsible for lag. Companies that sell cloud-based software can use it and thereby ensure things are running well for their customers. ThousandEyes can also help spot issues that could affect employees who use cloud applications inside big companies. Administrators can set up dashboards to observe trends and alerts to find out about problems right away.

ThousandEyes competes with network-performance management software from legacy vendors like IBM and BMC as well as startups like NetScout, SevOne, and VSS Monitoring. The company raised $5.5 million from Sequoia Capital and angel investors in June of last year. Its customers include Evernote, Jive Software, Dropbox, Zendesk and Zynga.