So I ran two sets of profile data. One with syntax turned off and one with 
syntax turned on. In both cases the opening of a new line took a long time. 
With Syntax off it took around 12 seconds. With Syntax on it took considerably 
longer. Neither  was ideal. Here are the respective sets of results. It seems 
almost all of the time is spent in GetRubyIndent() and GetMSL(). Note that if I 
open a line near the start of this huge array things are a lot faster than if I 
do it near the end. It is the tracking back up the array that seems to be 
relevant here.

WITH SYNTAX OFF
FUNCTIONS SORTED ON TOTAL TIME
count  total (s)   self (s)  function
    1  11.429995   0.000433  GetRubyIndent()
    1  11.428750   2.905020  <SNR>31_GetMSL()
242303   6.722091   5.662566  <SNR>31_Match()
40382   1.802138   1.301368  <SNR>31_PrevNonBlankNonString()
121145   1.560333             <SNR>31_IsInStringOrComment()
    6   0.000524             <SNR>18_Highlight_Matching_Pair()
    1   0.000281   0.000255  <SNR>31_ExtraBrackets()
    1   0.000113             <SNR>19_LocalBrowse()
    1   0.000011             <SNR>31_IsInStringOrDocumentation()
    1   0.000008             <SNR>31_IsInString()


WITH SYNTAX ON
FUNCTIONS SORTED ON TOTAL TIME
count  total (s)   self (s)  function
    2 380.583226   0.000717  GetRubyIndent()
    2 380.576016   7.012970  <SNR>28_GetMSL()
242281 355.479600             <SNR>28_IsInStringOrComment()
80761 333.381260   3.834304  <SNR>28_PrevNonBlankNonString()
484588  40.187259  14.255150  <SNR>28_Match()
   67   0.011742             <SNR>18_Highlight_Matching_Pair()
    1   0.008798   0.003935  <SNR>10_LoadFTPlugin()
    1   0.005508   0.001476  <SNR>5_SynSet()
    2   0.001664   0.001185  <SNR>8_BMMunge()
    1   0.001389   0.001338  <SNR>11_LoadIndent()
    1   0.001269   0.000272  <SNR>8_BMAdd()
    1   0.001183   0.000353  <SNR>8_BMRemove()
   10   0.001163             <SNR>19_LocalBrowse()
    1   0.000996   0.000128  <SNR>8_BMFilename()
    2   0.000521   0.000316  <SNR>28_ExtraBrackets()
    2   0.000479             <SNR>8_BMTruncName()
   15   0.000417             <SNR>27_map()
    2   0.000144             <SNR>28_IsInString()
   22   0.000064             <SNR>26_foldable()
    1   0.000042             <SNR>27_build_path()

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