Changed Default Gateway - Page loads very slowly [RESOLVED]

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Hi Guys,

a client's ISP changed the default gateway over the weekend,
since then the page loads very, very slowly. We can't really explain this.

Does anyone have an idea why this might be, or how we can narrow down the problem?
TL 2.6.1

Thanks

// SOLVED
ISP installed new firewall, which blocked some internal TL-redirect... don't ask me for details :D

[Ben]

Glad to hear you got things sorted out. Whenever a TL site starts running slowly, I've always found that it has something to do with server performance / data center / ISP routing.