cisco router 1841(i.e. gateway) getting slow

my cisco router 1841(i.e. gateway) getting slow always and when i ping this router from my LAN the response time is more than 300 ms and its veriations too. when i restarted it will working fine for sometimes only and response time will reduce to 1-2 ms but after sometims it will go very high again.
Please help me to fix this.
Who is Participating?
If you add up all of the bandwidth that the router may be handling, what number do you get? You may have reached its throughput limit.
Matt VCommented:
Can you post the results of show run with all the username/password and IPs obscured?
Jan SpringerCommented:
Also post:

  sh proc cpu sorted
  sh proc mem
  sh int | inc protocol|5 minute
  sh buffer
nainasipraAuthor Commented:
still under observation, i will get back to you soon.
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