High typing latency in MacOS Big Sur

Description

What steps will reproduce the problem?

I updated to MacOS Big Sur yesterday, and every since, typing in the editor has come with a great deal of latency - keystrokes occur nearly 0.5 seconds before characters appear in the editor. Interestingly, this issue is restricted to the editor - typing is fine in the console and in this issue reporter window.

Typing is slow whether in a brand new file or an existing one.

I tried updating spyder via conda, updating all of my other packages via conda update --all, and restarting my Mac multiple times.

Versions

• Spyder version: 4.1.5
• Python version: 3.8.1
• Qt version: 5.9.7
• PyQt5 version: 5.9.2
• Operating System: Darwin 20.1.0

Dependencies

# Mandatory:
applaunchservices >=0.1.7      :  0.2.1 (OK)
atomicwrites >=1.2.0           :  1.4.0 (OK)
chardet >=2.0.0                :  3.0.4 (OK)
cloudpickle >=0.5.0            :  1.6.0 (OK)
diff_match_patch >=20181111    :  20200713 (OK)
intervaltree                   :  None (OK)
IPython >=4.0                  :  7.19.0 (OK)
jedi =0.17.1                   :  0.17.1 (OK)
nbconvert >=4.0                :  6.0.7 (OK)
numpydoc >=0.6.0               :  1.1.0 (OK)
parso =0.7.0                   :  0.7.0 (OK)
pexpect >=4.4.0                :  4.8.0 (OK)
pickleshare >=0.4              :  0.7.5 (OK)
psutil >=5.3                   :  5.7.2 (OK)
pygments >=2.0                 :  2.7.2 (OK)
pylint >=1.0                   :  2.6.0 (OK)
pyls >=0.34.0;<1.0.0           :  0.35.1 (OK)
qdarkstyle >=2.8               :  2.8.1 (OK)
qtawesome >=0.5.7              :  1.0.1 (OK)
qtconsole >=4.6.0              :  4.7.7 (OK)
qtpy >=1.5.0                   :  1.9.0 (OK)
rtree >=0.8.3                  :  0.9.4 (OK)
sphinx >=0.6.6                 :  3.2.1 (OK)
spyder_kernels >=1.9.4;<1.10.0 :  1.9.4 (OK)
watchdog                       :  None (OK)
zmq >=17                       :  19.0.2 (OK)

# Optional:
cython >=0.21                  :  0.29.21 (OK)
matplotlib >=2.0.0             :  3.3.2 (OK)
numpy >=1.7                    :  1.19.2 (OK)
pandas >=0.13.1                :  1.1.3 (OK)
scipy >=0.17.0                 :  1.5.2 (OK)
sympy >=0.7.3                  :  1.6.2 (OK)

# Spyder plugins:
spyder_notebook                :  0.3.0 (OK)

[ccordoba12]

Thanks a lot for your help @vancromy! If things are working fine for you (minus the small latency) in 5.12, please stay with that version.

[wenlzhang]

Similar issue here. For me, besides the typing latency, it also becomes very slow when switching to another file tab after updating to Big Sur. It took around 3 to 4 seconds for this.

I completely re-installed miniconda and re-installed Spyder into a new conda environment for a few times, but the issue persists.