Hi, Em, thanks for your response. But seems a have a problem.
I wrote a script, which sends a queries (curl based), with a certain delay.
I had made a dictionary of matched words. I run my script with 500ms delay
during 60 seconds. Take look at catalina logs:

INFO: [] webapp=/solr path=/select
params={fl=fileds_from_schema_here,score&sort=score+desc&start=0&q="baby"&wt=json&fq=Date:[2012-01-23T00:00:00Z+TO+2012-02-21T23:59:59Z]&rows=500}
status=0 QTime=1735
INFO: [] webapp=/solr path=/select
params={fl=fileds_from_schema_here,score&sort=score+desc&start=0&q="girl"&wt=json&fq=Date:[2012-01-23T00:00:00Z+TO+2012-02-21T23:59:59Z]&rows=500}
status=0 QTime=9794

INFO: [] webapp=/solr path=/select
params={fl=fileds_from_schema_here,score&sort=score+desc&start=0&q="baby"&wt=json&fq=Date:[NOW-30DAY+TO+NOW]&rows=500}
status=0 QTime=13885
INFO: [] webapp=/solr path=/select
params={fl=fileds_from_schema_here,score&sort=score+desc&start=0&q="girl"&wt=json&fq=Date:[NOW-30DAY+TO+NOW]&rows=500}
status=0 QTime=33995

Note, that not all queries from the second test are slower, for example:
INFO: [] webapp=/solr path=/select
params={fl=fileds_from_schema_here,score&sort=score+desc&start=0&q="with"&wt=json&fq=Date:[2012-01-23T00:00:00Z+TO+2012-02-21T23:59:59Z]&rows=500}
status=0 QTime=18645 

INFO: [] webapp=/solr path=/select
params={fl=fileds_from_schema_here,score&sort=score+desc&start=0&q="with"&wt=json&fq=Date:[NOW-30DAY+TO+NOW]&rows=500}
status=0 QTime=7877

but in average I have:
*** Date:[2012-01-23T00:00:00Z+TO+2012-02-21T23:59:59Z] ***
Queries processed: 110
Queries cancelled: 4
Max QTime is: 22728 ms
Avg QTime is: 6681.31 ms
Min QTime is:  ms

*** Date:[NOW-30DAY+TO+NOW] ***
Queries processed: 20
Queries cancelled: 94
Max QTime is: 45203 ms
Avg QTime is: 39195.2 ms
Min QTime is:  ms

I repeated this test more times - results seems equal. Is it true, that
[2012-01-23T00:00:00Z+TO+2012-02-21T23:59:59Z] is faster than
[NOW-30DAY+TO+NOW]
?

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