Daniel Hrisca

@MatinF can you send the file that shows this delay?

I am unable to replicate your problem. What specs does your PC have? 

``` alabaster==0.7.12 altgraph==0.17.2 arrow==1.2.2 astroid==2.11.7 asttokens==2.0.5 atomicwrites==1.4.1 attrs==21.4.0 autopep8==1.6.0 Babel==2.10.3 backcall==0.2.0 bcrypt==3.2.2 beautifulsoup4==4.11.1 binaryornot==0.4.4 bitstruct==8.15.1 black==22.8.0 bleach==5.0.1 canmatrix==0.9.5 cchardet==2.1.5 certifi==2022.6.15 cffi==1.15.1 chardet==5.0.0 charset-normalizer==2.1.0 click==8.1.3 cloudpickle==2.1.0 clr-loader==0.1.7 colorama==0.4.5 construct==2.10.68 cookiecutter==2.1.1 coverage==6.4.2...

I'm sorry Martin, I get no slowdown with a new environment and this pip freeze: ``` attrs==22.1.0 canmatrix==0.9.5 click==8.1.3 colorama==0.4.5 future==0.18.2 isal==1.0.1 lxml==4.9.1 lz4==4.0.2 natsort==8.2.0 numexpr==2.8.3 numpy==1.23.3 packaging==21.3 pandas==1.4.4 psutil==5.9.2...

Windows 10 x64, cpython 3.10 x64

``current`` and ``total`` are not confined in the interval 0..100 Can this be a problem for your progress bar?

> It takes around 4s for one iteration of the following for block (I added the progress stuff): > > ``` > for info in group.get_data_blocks(): > if self._callback: >...

please try the development branch code

please try the development branch code

> Another observation: > > ## The 'crosshair' in plots is white, which is not ideal for white background plots > See below example: > >  The cursor is...