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here are the timings in optimised mode : still spending 30% of the time in the temperature assembly.
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<div><font class="Apple-style-span" face="Courier">16536 +---------------------------------------------+------------+------------+</font></div>
<div><font class="Apple-style-span" face="Courier">16537 | Total wallclock time elapsed since start    |  1.21e+04s |            |</font></div>
<div><font class="Apple-style-span" face="Courier">16538 |                                             |            |            |</font></div>
<div><font class="Apple-style-span" face="Courier">16539 | Section                         | no. calls |  wall time | % of total |</font></div>
<div><font class="Apple-style-span" face="Courier">16540 +---------------------------------+-----------+------------+------------+</font></div>
<div><font class="Apple-style-span" face="Courier">16541 | Assemble Stokes system          |      1801 |       355s |       2.9% |</font></div>
<div><font class="Apple-style-span" face="Courier">16542 | Assemble temperature system     |      1801 |  3.66e+03s |        30% |</font></div>
<div><font class="Apple-style-span" face="Courier">16543 | Build Stokes preconditioner     |         1 |      3.62s |      0.03% |</font></div>
<div><font class="Apple-style-span" face="Courier">16544 | Build temperature preconditioner|      1801 |       514s |       4.3% |</font></div>
<div><font class="Apple-style-span" face="Courier">16545 | Solve Stokes system             |      1801 |  5.83e+03s |        48% |</font></div>
<div><font class="Apple-style-span" face="Courier">16546 | Solve temperature system        |      1801 |  1.16e+03s |       9.6% |</font></div>
<div><font class="Apple-style-span" face="Courier">16547 | Initialization                  |         2 |     0.339s |    0.0028% |</font></div>
<div><font class="Apple-style-span" face="Courier">16548 | Postprocessing                  |      1801 |       261s |       2.2% |</font></div>
<div><font class="Apple-style-span" face="Courier">16549 | Setup dof systems               |         1 |      2.05s |     0.017% |</font></div>
<div><font class="Apple-style-span" face="Courier">16550 +---------------------------------+-----------+------------+------------+</font></div>
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