Inquisit web slow to download the file


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tecnika
tecnika
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Hello, when running an online experiment in Inquisit web it takes a long time to download the file (it stay a while in the starting screen when the "Loading files..." writing appears). I am wondering what is the best way to reduce the loading time? The experiment has quite a number of heavy images so it is this a possible cause?


Dave
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tecnika - 1/18/2021
Hello, when running an online experiment in Inquisit web it takes a long time to download the file (it stay a while in the starting screen when the "Loading files..." writing appears). I am wondering what is the best way to reduce the loading time? The experiment has quite a number of heavy images so it is this a possible cause?


> The experiment has quite a number of heavy images so it is this a possible cause?

Yes. The only way to speed things up, then, is to reduce the file sizes of the images (lowering resolution, applying some amount of JPG compression) as much as possible.
a.wertgen
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I have a smiliar issue. I have a web experiment (programmed in Inquisit 5; https://mili2nd.eu/amxb) with a lot of images (130 to be precise). In sum these images are not that big (~ 14MB). I just tried to run it to see if everything works as planned but the experiment doesnt seem to start (Inquisit Player doesnt open the file). Might that have to do with the number of images or is the problem somewhere else? My browser (firefox) as well as IQ Player are up to date (6.3.4) and I can run the experiment on my computer just fine.

Thanks in advance!

Dave
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a.wertgen - 1/20/2021
I have a smiliar issue. I have a web experiment (programmed in Inquisit 5; https://mili2nd.eu/amxb) with a lot of images (130 to be precise). In sum these images are not that big (~ 14MB). I just tried to run it to see if everything works as planned but the experiment doesnt seem to start (Inquisit Player doesnt open the file). Might that have to do with the number of images or is the problem somewhere else? My browser (firefox) as well as IQ Player are up to date (6.3.4) and I can run the experiment on my computer just fine.

Thanks in advance!

The script is fine, but there's some weird launch issue with Firefox that I need to get to the bottom of in more detail (it's not specific to your experiment's start page, it appears to affect all). I can launch the script fine in other browsers (e.g. Edge or Chrome). We'll figure out why Firefox balks and get that fixed as quickly as possible.

Dave
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Dave - 1/20/2021
a.wertgen - 1/20/2021
I have a smiliar issue. I have a web experiment (programmed in Inquisit 5; https://mili2nd.eu/amxb) with a lot of images (130 to be precise). In sum these images are not that big (~ 14MB). I just tried to run it to see if everything works as planned but the experiment doesnt seem to start (Inquisit Player doesnt open the file). Might that have to do with the number of images or is the problem somewhere else? My browser (firefox) as well as IQ Player are up to date (6.3.4) and I can run the experiment on my computer just fine.

Thanks in advance!

The script is fine, but there's some weird launch issue with Firefox that I need to get to the bottom of in more detail (it's not specific to your experiment's start page, it appears to affect all). I can launch the script fine in other browsers (e.g. Edge or Chrome). We'll figure out why Firefox balks and get that fixed as quickly as possible.

The Firefox launch issue should be resolved as of the time of writing.

a.wertgen
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Dave - 1/20/2021
Dave - 1/20/2021
a.wertgen - 1/20/2021
I have a smiliar issue. I have a web experiment (programmed in Inquisit 5; https://mili2nd.eu/amxb) with a lot of images (130 to be precise). In sum these images are not that big (~ 14MB). I just tried to run it to see if everything works as planned but the experiment doesnt seem to start (Inquisit Player doesnt open the file). Might that have to do with the number of images or is the problem somewhere else? My browser (firefox) as well as IQ Player are up to date (6.3.4) and I can run the experiment on my computer just fine.

Thanks in advance!

The script is fine, but there's some weird launch issue with Firefox that I need to get to the bottom of in more detail (it's not specific to your experiment's start page, it appears to affect all). I can launch the script fine in other browsers (e.g. Edge or Chrome). We'll figure out why Firefox balks and get that fixed as quickly as possible.

The Firefox launch issue should be resolved as of the time of writing.
That was fast, thank you very much!

rhollett
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Hi,

I have a very image-heavy experiment with over 1200 files uploaded to my Inquisit web license in total. However, not all the images are used for each administration. I use a selection script and a batch file to allow participants to select their preferred version of the experiment, each of which involve less than 150 jpg images (around 40KB each - or around 6MB). However, the load time is insanely slow, probably because the player is downloading every single file in the web experiment, rather than just the one's needed for the version selected by the participant. I think the image files are already sufficiently compressed but the download time in testing seems ridiculous given my internet speed (literally waiting 10-15minutes in Chrome).

Is there any way I can improve the efficiency of this delivery? Obviously I cannot deploy this experiment the way it is and using multiple web licenses seems inefficient (and expensive) given how many versions there are. 

Thanks in advance.
Dave
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rhollett - 1/12/2022
Hi,

I have a very image-heavy experiment with over 1200 files uploaded to my Inquisit web license in total. However, not all the images are used for each administration. I use a selection script and a batch file to allow participants to select their preferred version of the experiment, each of which involve less than 150 jpg images (around 40KB each - or around 6MB). However, the load time is insanely slow, probably because the player is downloading every single file in the web experiment, rather than just the one's needed for the version selected by the participant. I think the image files are already sufficiently compressed but the download time in testing seems ridiculous given my internet speed (literally waiting 10-15minutes in Chrome).

Is there any way I can improve the efficiency of this delivery? Obviously I cannot deploy this experiment the way it is and using multiple web licenses seems inefficient (and expensive) given how many versions there are. 

Thanks in advance.

> However, the load time is insanely slow, probably because the player is downloading every single file in the web experiment, rather than just the one's needed for the version selected by the participant.

The way you've implemented the selection, every file has to be downloaded. If you can move the selection outside Inquisit, you can treat each version as its own condition and run only that condition based on the selection. Then only the files applicable to that version would have to be downloaded. I.e.

<batch cider>
/ subjects = (1 of 9)
/ groupassignment = groupnumber
/ file = "DART_cider.iqx"
</batch>

<batch beer>
/ subjects = (2 of 9)
/ groupassignment = groupnumber
/ file = "DART_beer.iqx"
</batch>

...

<batch whiskey>
/ subjects = (9 of 9)
/ groupassignment = groupnumber
/ file = "DART_premix_whiskey.iqx"
</batch>


with



where

https://mili2nd.co/cj5b?version=1 would launch the cider version.
https://mili2nd.co/cj5b?version=2 would launch the beer version, and so forth.

seandr
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I'll add that we did A LOT of download optimization work in Inquisit 6. Download times, especially for large numbers of files, should be a fraction of what they were with Inquisit 5. You might consider upgrading, if that is an option.

-Sean
Dave
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seandr - 1/12/2022
I'll add that we did A LOT of download optimization work in Inquisit 6. Download times, especially for large numbers of files, should be a fraction of what they were with Inquisit 5. You might consider upgrading, if that is an option.

-Sean

Adding: If upgrading is an option, using a conditional <include> to administer the different item sets based on a parameter value would be available as an alternative way of setting this up under Inquisit 6. This would leave the selection process within Inquisit (no need for separate conditions) and would only require the download of the files applicable to the selected version. Inquisit 5's conditional <include> capabilities are more limited than Inquisit 6's, so this is not feasible under Inquisit 5.

Edited 6 Months Ago by Dave
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