I also had lag issues with my wallet.  It was never really worse than a lag, but it was annoying as f**k.  I run Windows 7 as my operating system only because I hate all the newer stuff, and I have 4 GB of memory and a 500 GB HDD.  I run several coin wallets and this was the only one that had this issue.  

I also initially thought that the random MN rewards thing was kind of neat.  Especially when I landed a big payout that first 24 hours after setting it up.  But after that almost nothing.  I went days without getting rewards (multiple times), and when I finally did, I'd see 1 SAGA or 0.5 SAGA, or something else small.  Over the next 3 weeks, I averaged less than 8 a day.  A far cry from the 20+ as stated on the masternode monitoring sites.  And in the last few days the daily earned number has fallen significantly from almost 30 to now 21, but there were hardly enough new MNs joining online to explain the drop.  The question was asked, before, but was ignored.  

Anyway, this was enough for me.  It's a good coin, with a good development team behind it, and the discord is a great place.  But the lack of rewards structure just isn't for me.  I thought I'd like it, but I grew to hate it.