-----------------serial conn------------------------|
[[R1]]    -----------------serial conn-----------------------||
|         -----------------serial conn----------------------|||
|         -----------------serial conn---------------------||||
|                                                          |||| 
|                                                          ||||
|                                                          ||||
|                                                          ||||
tunnel 0 on internet                                       ||||
|                                                          ||||
|                                                          ||||
|                                                          ||||
|                                                          ||||
|                                                          ||||
tunnel0 
[[r-t]] ----------- Tunnnel on LAN bet R2 and R-T------- [[[R2]]]
                                                            Ether
                                                             |
                                                             |
                                                             |
                                                             |

Notes
----------
-OSPF is used on all routers
- serials and tunnels interfaces are defined in OSPF area0
- R1 is doing redistrebution of  ( connected and static ) routes to R1 on Serials and to R-T through the tunnel
- R2 id doing also redistrebution for connected and static routes -- plz correct me if that solution iswrong.
-R-T has static route that if any packet want to go addrss of R1 it should go to Address of ISP interface -- 
                                    plz if i am wrong in that static route i need to correct me what can i do

-R1 is connected to internet and doing the NAT.
-R2 making the load balnce on 5 links and also R2 for incomming traffic that want to go R1
-R1 is the Gatway of Last resort. and giving the default route to R-T through the tunnel 0
- i tried to adjust the MTU on tunnels to be 1500 but same problem remain.

Can you suggest any solution as i have slow and bad internet browsing and file download performance.

Regards