We recently upgraded our firmware from 12.3.01e to 12.4.00g. Other than adding a few ports & virtual servers, nothing in the config was changed.
After running for a few days, I noticed our performance has degraded by about 15%. About 99% of our traffic comes through a single VIP with SSL termination. We handle about 20M .aspx requests/day. The average time for each went from 475ms to 550ms.
Has anyone else noticed a performance decrease with 12.4?