Hi Kevin,
What "other programs" are running fine? Excel and Word hardly use your network at all. Your accounting exercises the network more than anything (even streaming video is only one directional). The network connection can be "good" but can still be slow. You need at least a 100MBit network for Adagio, and in large sites we'd recommend a 1GBit solution. If you're still running Windows 98, you might still have some 10MBit hubs affecting your network performance.
Copy your data to a local drive (drive C) and "point" Receivables at the copy. See how fast a customer look up takes on the local copy. If this is beyond your technical skill, then an Adagio consultant will be happy to help you by logging on to your machine, although I'm sure that charges will apply.
There are significant changes in Accounts Receivable V9.0A that are documented in the release note. Have you carefully reviewed the document and tested out the items that might apply to you? Are you comfortable modifying the layout of your statements and other forms to take advantage of the new formatted address?
Adagio runs fine when properly configured and installed. The underlying database can process more than 10,000 records a second on a modern machine. How many customers are in your database? Have you excluded your accounting data from your anti-virus scannng?
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Andrew Bates