What is the query volume? How many queries can I issue?

The Google Mini serves up to 25 queries/second. In case of additional spikes in query load, users will experience an increase in mean response time, but requests will be queued for an orderly response as system resources become available. In addition, we have customers who deploy multiple Google Minis behind a load balancer to handle a great query volume. However, we do not guarantee any kind of performance SLA of the Google Mini because its performance strongly depends on the other network components it interacts with (web/file servers crawled, network load and latency, the geographical distribution of the user etc.) If the number of queries grows, they will be stored and served in FIFO logic. You may want to review the Load Balance Article.