First, I'm a genuine fan of Themeum.
So, I may be biased, but I'll try not to be.
I've purchased TutorLMS from them and the progress is amazing.
They keep churning feature after feature, and I speculate that they would do the same for Qubely.
I have used Qubely when it first came out, and in my experience, it was slowing down my page load speed.
Fast forward a year or two and I am just speechless on their progress.
Since, I had a negative experience; I didn't have any expectations for it.
So, I just checked out the free version, and it was blazing fast.
I immediately stacked three codes, and that is that.

Pros:
- Blazing fast
- Support is fantastic
- They keep churning out feature after feature
Cons
- Can't find any yet.