Fusion Titles are choppy and seem fixed in duration

The new fusion titles look awesome, but they seem to take up an extreme amount of processing power.

I'm running DR on what I believe to be a fairly decent computer:
CPU: Intel Core i7-7820X clocked at 3.6GHz
Memory: 32GB DIMM running at 2133MHz
Graphics card is a NVidia GeForce GTX 1080
Hard drive for cache is an Intel SSD6 that does 1800MB/s reads and around 550MB/s writes.

Issue 1:
The simple act of dragging a fusion title to the timeline of a single, short 1080 clip is VERY choppy and lags alot.

Issue 2:
It seems like Fusion is rendering something in the background when I first apply the title, making the timeline stutter like mad. Surely this could be easilly handled by the GFX card as a proxy until Fusion completes it's background task?

Issue 3:
The Fusion animations cannot be modified in length/time. If I stretch out the text duration, it still does its thing in the original time. I'd like the text to take longer before fading away, but I haven't found anything that can help me modify it's duration.

I understand that Issues 2 and 3 probably come from some fusion process doing stuff in the background, but it is making these effects hamper the smooth editing that you can do with regular titles. Also, obviously, since we're running on powerful graphics cards, it is only natural that this kind of effects should be done immediately in the graphics card as a proxy while fusion finishes the higher quality result in the background.

Just my 2c. Other thna that, the effects are a welcome addition to resolve! Is hoping to see some cool clip transitions in the near future too much?

Issue 3:
The Fusion animations cannot be modified in length/time. If I stretch out the text duration, it still does its thing in the original time. I'd like the text to take longer before fading away, but I haven't found anything that can help me modify it's duration.

I played with them a bit but couldn't figure it out, I found one "3D lower 3rd planes rotating in" title that stays longer if you extend the duration, but that's it. There's no speed control on properties page and 'change clip speed' does nothing. It's a shame such powerful titles are pretty much useless without that control.

I played with them a bit but couldn't figure it out, I found one "3D lower 3rd planes rotating in" title that stays longer if you extend the duration, but that's it. There's no speed control on properties page and 'change clip speed' does nothing. It's a shame such powerful titles are pretty much useless without that control.

Update - yet another title staying longer than others is "Lower 3rd draw on two line" and that's it, I have tried them all.

I am experiencing a very choppy playback as well.

When I add the Digital Glitch Lower Third, my playback goes all the way from a solid 60 fps to 12-15 fps. The weird thing is that when the titles comes in, neither my CPU nor GPU change utilization in any way. It is like the Fusion title is performance limited in itself.
I am editing a h.264 High L5.1 video with 6 audio PCM tracks.

My system is
Intel i7 8700 @ 3.8 GHz (Turbo)
32 GB DDR 4
Nvidia GTX 1070 Ti 8GB

DR runs on a SSD
Movies are on a dedicated HDD