I often do the same. The main other problem beside performance is that often chrome end up closed and when re-open, all opened tabs restored but reloaded. There are many ways to go for such approach though.
Using bookmarking. From the menu go to
Show bookmarks bar. Now when you opened multiple tabs, right click on one of them and select
Bookmark all tabs.... Make new folder for these tabs and name it as you wish and put the folder on the bookmark bar. That way you can load them all by right clicking on that folder and re-open all of them (or separately if you wish) at whatever time you like.
Pin the tabs. Right clicking on the tab then choosing
Pin Tab is another way to keep the tabs for later. You can select multiple tabs by holding Ctrl + Left single clicking on every tab you wish (You will notice that selected tabs are brighter than others).
I'm sure there are more ways. But performance wise, you might want to consider saving them as bookmarks and reload every one (or couple..etc) at a time.