As you said:
That would be pretty slow.
That's why I thought of having StorePic and RecallPic. Besides, it isn't really "annoying".
This is a screenshot of Rhombus P's engine for his abandoned idea, Man of War. I have shown it to the community before, they may find it familiar. Is the gameplay here annoying?

The code in that demo is:
:"SPRITES
:"XXJYXX NIIIN ozoqvq σx[yhat][xhat][yhat][xhat] ::H:H: 48X84 QIIIIQ →Str1
:For(A,1,50,6
:Text(‾1,A,0,"
:End
:Horizontal ‾55
:
:"MAP DATA
:{1111111111111,1333100010001,1000770010001,1000500010001,1000100010001,1111000000001,10001000100001,1000000010001,1111111111111,2,2→L1
:
:Text(56,60,"LOADING...
:
:"------------
:"BEGIN LOAD
:"------------
:
:{9,13→dim([A]
:1E12→θ
:1→D
:L1(1)→Z
:Fix 1
:For(A,1,9
:If θ=.1
:Then
:D+1→D
:L1(D)→Z
:1E12→θ
:End
:For(B,1,13
:iPart(Z/θ
:fPart(Ans/10
:Ans10
:Ans→[A](A,B
:θ/10→θ
:End
:End
:Float
:Lbl A
:
:"------------
:"DRAW
:"------------
:
:For(A,9,1,‾1
:For(B,1,13
:If [A](A,B
:Then
:For(C,1,8
:Text(6A-6,(7B-6)+C,sub(Str1,([A](A,B)8)-8+C,1
:End
:End
:End
:End
:StorePic 1
:For(A,1,7
:Text((L1(10)6)-6,((L1(11)7)-7)+A,sub("N[yhat]![yhat]N ",A,1
:End
:RecallPic 1
:Text(‾1,56,0,"
:L1(10→A
:L1(11→B
:
:"COLISION DETECTION. IF THE VALUE IS THE SAME AS THE INDEX,THATSRRITE IS SOLID
:
:
:{2,1,2,3,5,5,6,5→L3
:While 1
:Repeat Ans
:getKey
:End
:Ans→K
:Text((A6)-6,(B7)-7,"
:B-(K=24 and [A](A,B-1)≠L3([A](A,B-1)+1))+(K=26 and [A](A,B+1)≠L3([A](A,B+1)+1))→B
:A+(K=34 and [A](A+1,B)≠L3([A](A+1,B)+1))-(K=25 and [A](A-1,B)≠L3([A](A-1,B)+1))→A
:For(θ,1,7
:Text(6A-6,(7B-6)+θ,sub("N[yhat]![yhat]N ",θ,1
:End
:RecallPic 1
:End
I can think of a FEW optimizations, but that's beside the point…
The
RecallPic command is used there, in that
While 1 loop at the end. That's what I was thinking for that.
Also, from the screenshot, it seems some pixels to the LEFT are also erased. And because I want it fast, and there is no faster way in TI-BASIC to display multiple pixels at a time, I see no other way.
P.S. Nice picture-to-list routine, Xeda! I haven't seen you around here for a while, although I know you've been visiting my Shutdown thread on Omnimaga. ;-)