Structure array slower than loose variables

I need to pass a large number of variables into a number of functions. Passing every variable individually is messy and makes expansion of the code tricky. I used structured arrays to tidy up my variables and package them together into related groups but I have found that this significantly slows down my code (takes approximately 40% longer to execute). I have tried 'unpacking' my data using Method 1 in the following question but this makes no difference.

https://uk.mathworks.com/matlabcentral/answers/367479-efficiency-using-struct-field-vs-variable

Loose variables:

output=examplefunction(variable1,variable2,variable3)

Structured:

output=examplefunction(SimulationParameters)
% Unpack data
variable1=SimulationParameters.variable1; 
variable2=SimulationParameters.variable2;
variable3=SimulationParameters.variable3;

Are strutures always slower? Are there any other methods for speeding up structures? Official Matlab documentation doesn't provide any guidance on speed. This web page seems to suggest that structures are tidy but slow.

http://www-h.eng.cam.ac.uk/help/tpl/programs/Matlab/faster_scripts.html

Thanks, M

Answer 1

[Bruno Luong]

Yes acessing field names is slow., so try to avoid doing it intensively.

[MCH]

Thanks Bruno. So the best method for any computationally intensive functions would be to pass loose variables?

[Bruno Luong]

Can't you reduce the number of variables by putting them for example in an array? What are they?