I upgraded the G41T-M5 to 4Gb RAM and added a Galaxy GT620 2Gb RAM graphics card.
The GT620 is the lowest-end graphics card from the 600-series. It should be no surprise you’ve got performance bottlenecks. That card is great for MS Office or maybe Photoshop, but for 3D… You really couldn’t do much worse. No offense, but that’s certainly a huge bottleneck.
As for using a TV instead of an actual monitor… Well, that’s rather ridiculous, but if it’s keeping you working then keep at it! Just don’t expect any precision, print compatibility, or decent imaging from it.
Really you need the proper tools for the job. There are many such proper tools, but you’ve listed none here.