big commerce admin very slow

There seems to be a significant change in BC Admin as it is very very (almost painfully) slow and/or getting kicked off often or not loading. We actually have already had our own router changed and tech out with all systems working well on our side. Yes...I do often have more than one tab open as we discussed once before but I have always worked this way in BC before. Past two months has been horrible. I realize many work with spreadsheets for updating products but that is not very feasible for us with each item different (hence several tabs open). The speed lately makes Sitebuilder seem 'swift'.