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Question: How to improve code for getting all diameter -2 Nonisomorphismgraphs of order 10 ?

Question: How to improve code for getting all diameter -2 Nonisomorphismgraphs of order 10 ?

lcz 994 Maple 2018
graphtheory order
April 30 2019
0

  I want list all  diameter-2  Nonisomorphismgraphs  of order n . I use the following code, but its running speed  is slow with  order of graph gradually increasing . (for example,n=10)
 Are there other ways to Improve it? 
restart:
with(GraphTheory):
Graphs_data:=[NonIsomorphicGraphs(4,restrictto =[connected], output = graphs, outputform =graph)]:
Diameter_select:=select[flatten](t->Diameter(t)=2,Graphs_data):
DrawGraph(Diameter_select,size=[50,50]);
  By the way,  Why doesn't size=[50,50] work ?

 
                       
                   
               
               
           
           
               
                   
                 
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