What is the fastest way to run a query to get an event count on a timechart per host?

[Splunk77]

What is the fastest way to run a query to get an event count on a timechart per host? This is for windows events and I want to get a list of how many events each device is logging per month so that I can identify the increase/decrease.

They are all ingested in one index. A query like this will take a while to run if run for about a year. Is there a faster way to get this data?

index=<index_name>
| timechart count by Computer span=1mon

Thanks.

[richgalloway]

The tstats command will be faster, but processing a year of data for all hosts will still take a long time.

| tstats prestats=true count where index=foo by _time,host span=1mon
| timechart span=1mon count by host