Same app using dblink refuses to keep on rail

Hello.
Think a while this strange behavior:
I've a very well performed Apex app running for near two years in production. The app into the LAN "fly", and the access from Internet is very quick.
Many times I replayed the app in other servers with good performance, and now that I've to open a remote office with many users, I thought I'd install a remote server with the same app running locally against a local workspace with the same name that the workspace in the central location. The remote office workspace have no tables but views of the type
create view customers as select * from customers@mydblink
I thought using this architecture, the app should be faster than accessing trough Internet for two reasons:
a. All access to the program and the rendering is locally processed.
b. Building collections (I use many of them) is also local.
I accesed from sqlplus / sqldeveloper and all the data is in place as if was a local schema, then the dblink is working well and quick (for now I'm testing this server into the LAN)
Then, I installed the app in the remote office server (yet into the LAN), and the first I noticed is that the all works but the performance is poor. Let explain: The access to the central location application through Internet, is more quick that accessing to the remote location app into the LAN.
Additionally, often when I try to click for example in a tab, I redirected to a pure blank page, and another times, appears a save as window entitled "Opening wwv_flow.accept"
The dialog box says: You choosed opening wwv_flow_accept, which is a: BIN file, from: http://10.0.0.9:8080. Would you like to save this file?
The file (binary) content is: " Linuxi386/Linux-2.0.34-8.1.0 "
I restart the process from scratch in two different machines, with 32 and 64 linux versions, with both Oracle 11r1 database and Oracle XE, both with Apex 3.12, and allways I get the same result.
I yet can't understand why if Apex runs quick with a local schema, and querys to a remote dblinked schema is quick accesed, the combination of that two situations dont works as expected.
Thank you for suggestions.

Hello,
If you're doing everything using DBLinks, then that could be a huge performance overhead as Oracle obviously needs to pull over the result set via the DBLink, however the situation might be much worse than that as the CBO might pull over (the network) the entire datasets to filter locally and sort locally etc.
I might be missing something here, but if you say you have a very well behaving application, why not let the remote office access that one directly, since performance will be much better than going the DBLink route.
John.
Blog: http://jes.blogs.shellprompt.net
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