internet connection is slow connected to cisco 2800

[Lost & Found]

hi,

Here's my configuration kind check it. Connection to ISP (IDU) - Router (2600) - SW (2950) - Workstation.

Problem: Slow and its loading and loading . but when im directly connected to IDU it's good.

I can ping all the outside interface and it working fine.

thisisatest#sh run
Building configuration...

Current configuration : 1225 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname thisisatest
!
boot-start-marker
boot-end-marker
!
enable password test123
!
no aaa new-model
!
!
ip cef
!
!
multilink bundle-name authenticated
!
!
!
username test123 privilege 15 password 0 test123
archive
 log config
  hidekeys
!
!
!
!
!
interface FastEthernet0/0
 ip address 121.96.63.177 255.255.255.240
 no ip redirects
 no ip proxy-arp
 ip nat inside
 no ip virtual-reassembly
 duplex full
 speed auto
!
interface FastEthernet0/1
 ip address 121.96.66.18 255.255.255.252
 no ip redirects
 no ip proxy-arp
 ip flow ingress
 ip flow egress
 ip nat outside
 no ip virtual-reassembly
 duplex full
 speed auto
!
ip route 0.0.0.0 0.0.0.0 121.96.66.17
ip route 0.0.0.0 0.0.0.0 111.76.63.179
ip route 10.34.0.0 255.255.0.0 111.76.63.178
!
!
ip http server
ip nat inside source static 111.76.63.177 111.76.66.18
!
!
!
control-plane
!
!
line con 0
line aux 0
line vty 0 4
 password test123
 login
!
scheduler allocate 20000 1000
!
end

[Mark Malone]

you have 2 default routes , you should only have 1 unless the other 1 is weighted as a backup , your telling hosts going to the internet to go to 2 different addresses as the next hop i would remove the invalid 1 for a start

If you have confirmed the internet connection is good by connecting directly , run a show interface for lan/wan connection as well make sure there are no crcs . inputs collisions etc that might indicate layer 1 issue that can slow down traffic on the router