Hardware specs for running roll20 with Dynamic Lighting?

My PC is an ancient beast and I need to upgrade to something new. I want to ensure that the replacement will run roll20 smoothly and hassle free. I am going to be attempting to run Dungeon of the Mad Mage, so lots of maps full of tokens! Would a laptop such as this do the trick?

HP EliteBook 840 G2, Intel Core i5-5300U up to 2.3 GHz, 8GB RAM, 500 GB SATA Laptop Computer Windows 10 Pro (Renewed) https://www.amazon.ca/dp/B07NV1WJ3P/ref=cm_sw_r_other_apa_i_9of1EbV8AN1V6

Or would I need a PC with more power and a dedicated graphics card? Thank you for any help. I am new to roll20 and look forward to getting my game up and running asap. 

I believe the Updated Lighting System is shifting some of the load onto the GPU, but for now with the Legacy system I don't think a dedicated GPU will be a huge boost.

Having said that, the most potatoey device I've run a session on is a Surface Pro 4 i7 - this handles everything fine. I don't think you should have any problems with the i5-5300U and 8gb ram.

Thanks! I appreciate feedback from anyone who has used this system before. 

I've used my old k73e Asus laptop and it handled it ok but it was not that module. I ran a couple older modules through the computer.

For Legacy Dynamic Lighting, the bar is pretty low. I can run Roll20 on a Chromebook. I don't think I would try using it for Advanced Fog of War or UDL, though.

Playing as a player seems to run everything fine, but as soon as I log onto my game that I DM and try to mess around it slows down, a lot. With dynamic lighting and fog of war. I want those features as what's the point of doing a 23 floor dungeon without them (in my opinion)? Especially as soon as 1 of my players logged on to try that out it just stopped. I thought I'd need a better graphics card due to all the redrawing that module probably requires. I'm a bit worried now what the UDL might do once its released though... even with the new laptop I'm considering?