C3725adventerprisek9mz12415t14image Download Verified [updated] Online

This drops your CPU usage from 100% down to nearly 0% per idle router.

While Cisco.com is the only legal source for IOS images, specific legacy images like this are often sourced from community repositories for simulation purposes. c3725adventerprisek9mz12415t14image download verified

When importing into GNS3, choose "Yes" to decompress the image. This speeds up the boot time significantly. This drops your CPU usage from 100% down