Interrupt problem; you'll need a driver upgrade 

Forum: PCMCIA Serial and Modem Issues
Re: PCMCIA works very very very slowly (Benson Fung)
Date: 2000, Aug 28
From: David Hinds <dhinds@pcmcia.sourceforge.org>

This is an interrupt delivery problem. You will need to upgrade to a fairly recent PCMCIA package (3.1.19 is current), then specify: PCIC_OPTS="irq_mode=1" which, for this adapter, forces it to use PCI interrupts. -- Dave

to: "Interrupt problem; you'll need a driver upgrade"