Heavy contgnous load

Dear Anybody!

I use pgr to store records. But the characterisitc of the record traffic are
special. For example 50 of them arrived in one sec contignously trough weeks
and aligned interally trough tables.
To absorb this traffic I put the pgr database to ramdisk (fast as possible).
But after more day work the pgr slowing down.
What is important think for this task I do not need any tranasction. So the
COMMIT and ROLLBACK feature is useless.
The question is how I minimize the rollback activity to free resoureces?

Thanks for any idea.

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