Hello everyone,

I'd like to get some help with multiple imputation. I searched everywhere but couldn't find an answer to this problem I rant into.

I am trying to impute 3 variables using 'chained'


The initial dataset has 22,000 cases and V1 (11% missing), V2 (11% missing), and V3 (10% missing). It took 5 minutes to impute these 3 variables.
Later, I added more cases and it became 28,000 cases and V1 (19.5%), V2 (11.7%) and V3 (12.4%). Now it is taking forever.

Is this just because of the substantially increased missing values for V1 or the overall number?
Does anyone have a solution to this problem or suggestion to impute these variables?

Thank you always!