Dear community, since I added about 300 cms users (editors - not members), the save and publishing process for any node takes about 20 seconds, When I run a profiler on the sql server I could see that for every user following sql gets executed:

exec sp_executesql N'SELECT DISTINCT umbracoNode.id, umbracoUser2NodeNotify.userId, umbracoNode.nodeObjectType, umbracoUser2NodeNotify.action
FROM [umbracoUser2NodeNotify]
INNER JOIN [umbracoNode]
ON [umbracoUser2NodeNotify].[nodeId] = [umbracoNode].[id]
WHERE (([umbracoUser2NodeNotify].[userId] = @0))
ORDER BY ([umbracoNode].[id])',N'@0 int',@0=83

As we are not using any notifications, is there a way to disable them? as unfortunately, I need all the 300 users, and in the future, there will be even more required. In case this is not possible, would the best solution be to download the source and build my own umbraco version?
Thanks