I'm not quite sure how to get developer's rights on sourceforge,
otherwise I'd just fix it myself. I'm not really familiar with
contributing to open source projects, but I did notice this little
thing. Apparently, FBBlobField is allocating an unnecessary object for
the garbage collector to deal with. Consider this:

Blob getBlob() throws SQLException {

if (blob != null)
return blob;

if (rs.row[numCol]==null)
return BLOB_NULL_VALUE;

Long blobId = new Long(field.decodeLong(rs.row[numCol]));

blob = new FBBlob(c, blobId.longValue());

return blob;
}

Seems this should be re-written as follows to eliminate the unecessary
Long object instantiation:

Blob getBlob() throws SQLException {

if (blob != null)
return blob;

final byte[] bytes = rs.row[ numCol ];

if ( bytes == null )
return BLOB_NULL_VALUE;

blob = new FBBlob( c, field.decodeLong( bytes ) );
return blob;
}

Believe it or not, calling "rs.row[ numCol ]" has some overhead
associated with it (the accessing of "row" with "r" and the accessing of
"numCol" within "row", so this also collapses the array element access
to a single call in the case where rs.row[ numCol ] is not null. But the
main thing is the unneeded creation of the Long object.

Fwiw,

R.