Large excel table graphic is pixelated in Storyline 360

Hello,

We are emulating a large Excel table (4 columns with 200 rows) because we found that building such a large table in Storyline 360 caused the application to freeze.

We have created the table as a graphic (.png) and the graphic does not look pixelated if viewed in an image application (like Photoshop).  When the graphic is inserted into Storyline, it is pixelated.  

I read on a thread (old) that you can insert a graphic into a slide (off screen) and that you should make the graphic as huge as possible.  Then copy and paste the graphic, reducing to the size needed on the slide, whereby Storyline 360 will internally reference the resolution of the large image.  I tried this and it didn't work.

Does anyone recommend an alternative way to retain clarity when using large graphics in Storyline?

Thank you,

Andy