In general, a search for confirmed tandem splice sites (at least 1 EST/mRNA each) with e.g. the following settings (Species/Gene Symbol/Splice site distance/UTR,CDS) should not take longer than

20 sec
Human/s*/all/UTR,CDS (721 hits)
Human//delta3/CDS (1989 hits, standard settings)
Both//delta3/CDS (3532 hits)

2 min
Human//frame-preserving/CDS (3203 hits)
Mouse//frameshifting/CDS (1906 hits)

The performance was tested from several sites in Europe/North America.

If the same or similar searches taking you longer than above mentioned, please check your internet connection and contact