Hi Carlos,
It definitely was DNN in my case, and it has or at least had something to do with the events log and the scheduler logs being "large" I agree it shouldn't have had any impact at all, but when those two tables were purged in the DB, the site began to literally "fly" using 4.4.1.
My site was pegging out the CPU at almost 100% for up to 30 to 40 seconds per page called. We didn't do a thing, other than purge the two offending tables, Then we set a scheduled DB "task" in SQL to purge both tables periodicly ( I think it was about 20 days or so ) and I haven't had a single issue since.
Pages now load on first call in about 3 seconds from "hit" to "display" on my local screen from the remote site. With these two changes made, 4.4.1 literally "screams."
So, Lynn, there is hope and I am sure your host will give you the DB so you can purge it locally then FTP it back to them for re-attachment. If you explain the problem to them, asking them to set a "task" in SQL to purge the two tables once every couple of weeks or so, you should be fine.
Clay