In my experience this volume of logs will likely cause problems for your Orion system. It has less to do with your pollers and more to do with your database, it basically overwhelms the database. This is especially the case if you have NTA in addition to NPM and APM as all of those put a good load on the DB.
This is based on my previous experiences with Syslog and Orion, others may have had better experiences getting this to work.
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Not syslog but I did have performance issues when receiving several hundred traps per second a few years back. Honestly don't know however if it was the database or the poller that was the bottleneck.