Performance with bokeh models containing data-table widgets is slow when the model gets updated (streaming data to it or changing widgets), adding up to some seconds of delay. When debugging it in the browser, Chromium warns about "Recalculate Style
Warning: Forced reflow is a likely performance bottleneck." (see screenshot below).
bokeh 0. 13.0
python 3.6.6 Anaconda
Chromium 66.0.3359.139
Debian 4.16.5-1
Linux 4.16.0-1-amd64
Here's an example, where adding a button cases the delay, but also had the problem when adding data to a plot with holoviews pipes
import bokeh.io as bki
import bokeh.models as bkm
import bokeh.layouts as bkl
doc = bki.curdoc()
from datetime import date
from random import randint, choice
n = 20
data = dict(
dates=[date(2014, 3, i%30+1) for i in range(n)],
downloads=[randint(0, 100) for i in range(n)],
foo=[randint(0, 100) for i in range(n)],
bar=[randint(0, 100) for i in range(n)],
baz=[randint(0, 100) for i in range(n)],
)
source = bkm.ColumnDataSource(data)
columns = [
bkm.TableColumn(field="dates", title="Date", formatter=bkm.DateFormatter()),
bkm.TableColumn(field="downloads", title="Downloads"),
bkm.TableColumn(field="foo", title="Foo"),
bkm.TableColumn(field="bar", title="Bar"),
bkm.TableColumn(field="baz", title="Baz"),
]
table1 = bkm.DataTable(source=source, columns=columns[:-1])#, editable=True)
table2 = bkm.DataTable(source=source, columns=columns[1:])#, editable=True)
action = bkm.Button(label="click me")
foo = bkm.Button(label="foo")
box = bkl.widgetbox([action, foo], sizing_mode='scale_width')
def act():
#last = label = box.children[1].label
#while label == last:
label = choice(["foo", "bar", "baz", "bla"])
foo = bkm.Button(label=label)
box.children.insert(1, foo)
action.on_click(act)
doc.add_root(bkl.column(box, bkl.widgetbox(table1, table2)))
Performance with bokeh models containing data-table widgets is slow when the model gets updated (streaming data to it or changing widgets), adding up to some seconds of delay. When debugging it in the browser, Chromium warns about "Recalculate Style
Warning: Forced reflow is a likely performance bottleneck." (see screenshot below).
bokeh 0. 13.0
python 3.6.6 Anaconda
Chromium 66.0.3359.139
Debian 4.16.5-1
Linux 4.16.0-1-amd64
Here's an example, where adding a button cases the delay, but also had the problem when adding data to a plot with holoviews pipes