Genie download page not finishing load

[alisman]

If you look at network tab, you'll see that all requests eventually resolve but the spinner never goes away. Please investigate why that is. My hunch is that the genome nexus call (20s) is not being tracked properly.

https://genie.cbioportal.org/results/download?cancer_study_list=brca_akt1_genie_2019%2Cglioma_dfci_2020%2Cerbb2_genie_public%2Ccrc_public_genie_bpc%2Cnsclc_public_genie_bpc%2Cgenie_public%2Cmbc_genie_2020&tab_index=tab_visualize&profileFilter=mutations%2Ccna%2Cgistic%2Cstructural_variants&case_set_id=all&Action=Submit&gene_list=EGFR%250AERBB2%250AERBB3%250AERBB4%253A%2520MUT%253DS303F%253B

[alisman]

@gblaih good job on this one. i'm curious how you zero'd in on that code. this page now loads. However, i'm still seeing a huge amount of frontend latency and when i profile, i see this:

The orange is scripting and you can see that it's associated with what looks to me like mobx internals. What this suggests to me is that we are applying mobx on an enormous array when it's probably totally unnecessary. Mobx makes data observable but at great cost (when data is large) and often it's just the reference to a structure that really needs to be observable and not the internal data members. Lets discuss on Monday how to further improve.