Network throughput significantly degraded through ASA 5510. Lost about 50% of network throughput when connected through an ASA 5510. Any suggestions/ideas?
In addition to Alonzo's remarks in checking duplex etc.. I would suggest you gather basline overall traffic/connections information from the ASA firewall.. I have 515E's and I do use the following link for keeping eyes opened on performance issues when they appear, although the bellow link pertains for PIX 500 series most of the information in it can be used as an example in gathering info & troubleshooting performance on the ASA as well.
Likely the ASA is seeing traffic it does not like for some reason, review that, check logging levels and make sure you are logging errors not debugging and also any IDS checks.
Posting the overall config maybe helpful as well.
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